<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2020 Workiva-->
<!--r:162ee141-6b35-43c5-bf97-b6d1d3efc74d,g:e4fbc209-04a5-43b6-b2f6-1514bc9b0289-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/Cover" xlink:type="simple" xlink:href="crwd-20201031.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/Cover" xlink:type="extended" id="i937c51a367774741a24bf1ae3f3af246_Cover">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_88d6a16b-c30c-4b6b-b486-73a4c6867a7b" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_DocumentType_88d6a16b-c30c-4b6b-b486-73a4c6867a7b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_30841ab5-fe2d-402e-9332-9c28fcd898c8" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_DocumentQuarterlyReport_30841ab5-fe2d-402e-9332-9c28fcd898c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_2e96acb8-d5e0-4715-8b0e-c4eee849ffbf" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_DocumentPeriodEndDate_2e96acb8-d5e0-4715-8b0e-c4eee849ffbf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_94d6a664-ebc3-4589-bdaf-48b85c158fdb" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_DocumentTransitionReport_94d6a664-ebc3-4589-bdaf-48b85c158fdb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_acf4a1bd-da2a-407e-abe0-7309c84b75fd" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityFileNumber_acf4a1bd-da2a-407e-abe0-7309c84b75fd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_deed1d8f-1217-4865-93aa-a160346931ff" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityRegistrantName_deed1d8f-1217-4865-93aa-a160346931ff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_5dd1065e-cbc0-4554-9284-596372faa8ef" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityIncorporationStateCountryCode_5dd1065e-cbc0-4554-9284-596372faa8ef" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_94b5ae81-b0aa-4998-b7a8-99d8f575b601" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityTaxIdentificationNumber_94b5ae81-b0aa-4998-b7a8-99d8f575b601" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_538e55a9-309e-411e-b93d-fa02f34ae146" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityAddressAddressLine1_538e55a9-309e-411e-b93d-fa02f34ae146" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_3ac86d96-6a43-4d1e-8534-51eaac08053d" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityAddressAddressLine2_3ac86d96-6a43-4d1e-8534-51eaac08053d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_1e800bb7-15c3-4539-ad2d-fed8353e0cc3" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityAddressCityOrTown_1e800bb7-15c3-4539-ad2d-fed8353e0cc3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_78f29f75-fc95-4179-ad03-e384b48ff418" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityAddressStateOrProvince_78f29f75-fc95-4179-ad03-e384b48ff418" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_c58ba0ea-b6e9-4092-818d-4d5ba7849392" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityAddressPostalZipCode_c58ba0ea-b6e9-4092-818d-4d5ba7849392" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_92a21540-d2f7-4f7c-97bd-ba639d3ad3c3" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_Security12bTitle_92a21540-d2f7-4f7c-97bd-ba639d3ad3c3" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_89d33448-f426-478c-8d2b-3fd95427da87" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_TradingSymbol_89d33448-f426-478c-8d2b-3fd95427da87" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_0c08f373-e7dc-4ed8-a014-23091b42c769" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_SecurityExchangeName_0c08f373-e7dc-4ed8-a014-23091b42c769" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_337ccd50-e190-4f03-b6d2-d39f579d1957" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_CityAreaCode_337ccd50-e190-4f03-b6d2-d39f579d1957" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_b8af196a-6786-4518-b97d-78f513250861" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_LocalPhoneNumber_b8af196a-6786-4518-b97d-78f513250861" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_62f5379b-7207-4daf-adde-b285a47fee77" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityCurrentReportingStatus_62f5379b-7207-4daf-adde-b285a47fee77" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_8a22f9e3-bbca-40cc-913e-f91f508e2431" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityInteractiveDataCurrent_8a22f9e3-bbca-40cc-913e-f91f508e2431" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_6d69e5b6-0bcc-4e02-a1ae-7e58e8b423b7" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityFilerCategory_6d69e5b6-0bcc-4e02-a1ae-7e58e8b423b7" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_9fceff09-9861-4d59-b9a9-e70a929c543e" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntitySmallBusiness_9fceff09-9861-4d59-b9a9-e70a929c543e" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_d65ef0a6-fbc3-4d79-b704-317b7b6cb8fa" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityEmergingGrowthCompany_d65ef0a6-fbc3-4d79-b704-317b7b6cb8fa" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityExTransitionPeriod_cdce7405-3883-484e-b7f0-a5b47649eedc" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityExTransitionPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityExTransitionPeriod_cdce7405-3883-484e-b7f0-a5b47649eedc" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_76e3a0b2-dbca-4306-b001-1be0f2f7e193" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityShellCompany_76e3a0b2-dbca-4306-b001-1be0f2f7e193" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_53776a1e-593a-4624-9e84-a595c14f92a1" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_53776a1e-593a-4624-9e84-a595c14f92a1" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_98d004f8-487b-4d62-af87-c81e0ecc5f3e" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_EntityCentralIndexKey_98d004f8-487b-4d62-af87-c81e0ecc5f3e" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_ab05ce9a-cb76-4aac-990d-e0a2bab6f63c" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_CurrentFiscalYearEndDate_ab05ce9a-cb76-4aac-990d-e0a2bab6f63c" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_d17eacdf-e6c8-49d2-94a3-c8d614ad2ba7" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_DocumentFiscalYearFocus_d17eacdf-e6c8-49d2-94a3-c8d614ad2ba7" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_24a2983b-3175-4372-b83d-eef4b40dd937" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_DocumentFiscalPeriodFocus_24a2983b-3175-4372-b83d-eef4b40dd937" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_8a39d087-396a-49a4-9d5d-b9e87d36bc50" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_AmendmentFlag_8a39d087-396a-49a4-9d5d-b9e87d36bc50" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_1ccb93d0-fb65-49a2-b9e7-df1c3f744af2" xlink:href="https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_ca8bcb4f-3a47-4ebe-b07f-67dca4780013" xlink:to="loc_dei_DocumentInformationTable_1ccb93d0-fb65-49a2-b9e7-df1c3f744af2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_df00f696-3449-4415-8dd3-d17182243f1c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_1ccb93d0-fb65-49a2-b9e7-df1c3f744af2" xlink:to="loc_us-gaap_StatementClassOfStockAxis_df00f696-3449-4415-8dd3-d17182243f1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_df00f696-3449-4415-8dd3-d17182243f1c_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_df00f696-3449-4415-8dd3-d17182243f1c" xlink:to="loc_us-gaap_ClassOfStockDomain_df00f696-3449-4415-8dd3-d17182243f1c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_c071349b-0588-4276-9a1e-662cfc5db93f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_df00f696-3449-4415-8dd3-d17182243f1c" xlink:to="loc_us-gaap_ClassOfStockDomain_c071349b-0588-4276-9a1e-662cfc5db93f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_f6c62109-a1fb-43e6-903f-0cb24c97ee83" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_c071349b-0588-4276-9a1e-662cfc5db93f" xlink:to="loc_us-gaap_CommonClassAMember_f6c62109-a1fb-43e6-903f-0cb24c97ee83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_b08d6278-47c4-43ca-8469-1d2b5bf781ea" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_c071349b-0588-4276-9a1e-662cfc5db93f" xlink:to="loc_us-gaap_CommonClassBMember_b08d6278-47c4-43ca-8469-1d2b5bf781ea" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CondensedConsolidatedBalanceSheets" xlink:type="simple" xlink:href="crwd-20201031.xsd#CondensedConsolidatedBalanceSheets"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended" id="i2e0e4716a17b423b82de66ae6de48a2b_CondensedConsolidatedBalanceSheets">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_881cc639-8523-44a8-b285-b395d7d961a9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_2ca8b835-3399-470e-8627-423d21181b8e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_881cc639-8523-44a8-b285-b395d7d961a9" xlink:to="loc_us-gaap_AssetsAbstract_2ca8b835-3399-470e-8627-423d21181b8e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_c67db52a-33de-48f4-bc1a-f5ceab1f7cd7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2ca8b835-3399-470e-8627-423d21181b8e" xlink:to="loc_us-gaap_AssetsCurrentAbstract_c67db52a-33de-48f4-bc1a-f5ceab1f7cd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_136c670e-536e-4d42-a0dd-bf16bae5b61c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_c67db52a-33de-48f4-bc1a-f5ceab1f7cd7" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_136c670e-536e-4d42-a0dd-bf16bae5b61c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_1b47ed37-b7ea-4c95-b9e4-c01cb16f049d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_c67db52a-33de-48f4-bc1a-f5ceab1f7cd7" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_1b47ed37-b7ea-4c95-b9e4-c01cb16f049d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_f49ad070-8a5c-4458-adb7-bda70e6ae449" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_c67db52a-33de-48f4-bc1a-f5ceab1f7cd7" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_f49ad070-8a5c-4458-adb7-bda70e6ae449" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetCurrent_fce31595-dd5e-402f-8895-142423b3afd3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_c67db52a-33de-48f4-bc1a-f5ceab1f7cd7" xlink:to="loc_us-gaap_CapitalizedContractCostNetCurrent_fce31595-dd5e-402f-8895-142423b3afd3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_2bbc5946-7e12-4ab1-83ae-c9b0c3490302" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PrepaidExpenseAndOtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_c67db52a-33de-48f4-bc1a-f5ceab1f7cd7" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssetsCurrent_2bbc5946-7e12-4ab1-83ae-c9b0c3490302" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_b7e03bc9-604b-405c-8e89-62060ac75855" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_c67db52a-33de-48f4-bc1a-f5ceab1f7cd7" xlink:to="loc_us-gaap_AssetsCurrent_b7e03bc9-604b-405c-8e89-62060ac75855" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentAggregateCost_0f8278d8-73d2-4608-922b-02da8440cb9a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityMethodInvestmentAggregateCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2ca8b835-3399-470e-8627-423d21181b8e" xlink:to="loc_us-gaap_EquityMethodInvestmentAggregateCost_0f8278d8-73d2-4608-922b-02da8440cb9a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_d0596386-97b8-4d46-9a09-f5ae16a7f04b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2ca8b835-3399-470e-8627-423d21181b8e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_d0596386-97b8-4d46-9a09-f5ae16a7f04b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_4e03222b-c44a-43a7-9712-6ddb483094f2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2ca8b835-3399-470e-8627-423d21181b8e" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_4e03222b-c44a-43a7-9712-6ddb483094f2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_b953a073-7b63-43ee-813d-e5c2b957135d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2ca8b835-3399-470e-8627-423d21181b8e" xlink:to="loc_us-gaap_CapitalizedContractCostNetNoncurrent_b953a073-7b63-43ee-813d-e5c2b957135d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_8269461c-d9b0-4955-9301-8795c721cffd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2ca8b835-3399-470e-8627-423d21181b8e" xlink:to="loc_us-gaap_Goodwill_8269461c-d9b0-4955-9301-8795c721cffd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_64d1309e-b2b0-4ac9-a0cd-9a41d1233006" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2ca8b835-3399-470e-8627-423d21181b8e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_64d1309e-b2b0-4ac9-a0cd-9a41d1233006" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_6d53c993-2976-48bb-9c5f-112c990c1c32" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2ca8b835-3399-470e-8627-423d21181b8e" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_6d53c993-2976-48bb-9c5f-112c990c1c32" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_d6582237-c03d-484c-9f04-d67ccc85f583" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_2ca8b835-3399-470e-8627-423d21181b8e" xlink:to="loc_us-gaap_Assets_d6582237-c03d-484c-9f04-d67ccc85f583" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_31724ed9-b753-4ccf-aa2a-de7cf39e15a9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_881cc639-8523-44a8-b285-b395d7d961a9" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_31724ed9-b753-4ccf-aa2a-de7cf39e15a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_e1a72087-16e1-46ee-a8e9-fce0033b27c6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_31724ed9-b753-4ccf-aa2a-de7cf39e15a9" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_e1a72087-16e1-46ee-a8e9-fce0033b27c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_3bb19ed6-4ca3-4137-a56c-527e234ea7ff" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_e1a72087-16e1-46ee-a8e9-fce0033b27c6" xlink:to="loc_us-gaap_AccountsPayableCurrent_3bb19ed6-4ca3-4137-a56c-527e234ea7ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_fb2e8cb1-34a3-430f-9990-2ad0ce80c275" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_e1a72087-16e1-46ee-a8e9-fce0033b27c6" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_fb2e8cb1-34a3-430f-9990-2ad0ce80c275" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_ea6586b0-ddb3-48ee-9c77-96afd80f0d4c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_e1a72087-16e1-46ee-a8e9-fce0033b27c6" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_ea6586b0-ddb3-48ee-9c77-96afd80f0d4c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_040e67ed-c67c-4b54-a73a-5e4b74e169fe" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_e1a72087-16e1-46ee-a8e9-fce0033b27c6" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_040e67ed-c67c-4b54-a73a-5e4b74e169fe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_69107c79-7b17-4d93-ada9-fd02c94bde65" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_e1a72087-16e1-46ee-a8e9-fce0033b27c6" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_69107c79-7b17-4d93-ada9-fd02c94bde65" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_1c4d4882-f3cd-4de3-87eb-e98b905fb439" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_e1a72087-16e1-46ee-a8e9-fce0033b27c6" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_1c4d4882-f3cd-4de3-87eb-e98b905fb439" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_32ec5674-661f-40cc-86c8-a5432f0a455f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_e1a72087-16e1-46ee-a8e9-fce0033b27c6" xlink:to="loc_us-gaap_LiabilitiesCurrent_32ec5674-661f-40cc-86c8-a5432f0a455f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_0ba63d59-997c-4998-9a6a-6a649f9da0bc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_31724ed9-b753-4ccf-aa2a-de7cf39e15a9" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_0ba63d59-997c-4998-9a6a-6a649f9da0bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_2b9f7cf1-0fde-44f9-b098-0543c79f6fa9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_31724ed9-b753-4ccf-aa2a-de7cf39e15a9" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_2b9f7cf1-0fde-44f9-b098-0543c79f6fa9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_b3013932-e494-4329-9f06-1e5f8d077277" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_31724ed9-b753-4ccf-aa2a-de7cf39e15a9" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_b3013932-e494-4329-9f06-1e5f8d077277" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_3dca7ce0-95e1-4f0d-82d0-309998ca0773" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_31724ed9-b753-4ccf-aa2a-de7cf39e15a9" xlink:to="loc_us-gaap_Liabilities_3dca7ce0-95e1-4f0d-82d0-309998ca0773" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_25e2d2fa-4d6c-4ed5-a49d-a6d595fc989a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_31724ed9-b753-4ccf-aa2a-de7cf39e15a9" xlink:to="loc_us-gaap_CommitmentsAndContingencies_25e2d2fa-4d6c-4ed5-a49d-a6d595fc989a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_26b103e5-73c8-42ff-b405-7f98c4c95f5f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_31724ed9-b753-4ccf-aa2a-de7cf39e15a9" xlink:to="loc_us-gaap_StockholdersEquityAbstract_26b103e5-73c8-42ff-b405-7f98c4c95f5f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_6dfc9609-384d-4fec-bada-52eec92e6b96" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_26b103e5-73c8-42ff-b405-7f98c4c95f5f" xlink:to="loc_us-gaap_PreferredStockValue_6dfc9609-384d-4fec-bada-52eec92e6b96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_320d7657-0864-47d7-9113-e2298111e099" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_26b103e5-73c8-42ff-b405-7f98c4c95f5f" xlink:to="loc_us-gaap_CommonStockValue_320d7657-0864-47d7-9113-e2298111e099" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_5a9e1da7-1ca8-4728-936c-2d4d08606633" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_26b103e5-73c8-42ff-b405-7f98c4c95f5f" xlink:to="loc_us-gaap_AdditionalPaidInCapital_5a9e1da7-1ca8-4728-936c-2d4d08606633" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_492c5c4d-48f3-4cef-9b98-a7fb9c64517a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_26b103e5-73c8-42ff-b405-7f98c4c95f5f" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_492c5c4d-48f3-4cef-9b98-a7fb9c64517a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_168d0e3f-819e-49b8-beae-576beb8fa0b7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_26b103e5-73c8-42ff-b405-7f98c4c95f5f" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_168d0e3f-819e-49b8-beae-576beb8fa0b7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_54463025-ff3d-404a-8477-3eafe7ca6728" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_26b103e5-73c8-42ff-b405-7f98c4c95f5f" xlink:to="loc_us-gaap_StockholdersEquity_54463025-ff3d-404a-8477-3eafe7ca6728" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_cc805036-32d4-48fa-be0a-51594df9ab96" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MinorityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_26b103e5-73c8-42ff-b405-7f98c4c95f5f" xlink:to="loc_us-gaap_MinorityInterest_cc805036-32d4-48fa-be0a-51594df9ab96" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_724ab96a-9313-4eaf-811b-787cacc2d453" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_26b103e5-73c8-42ff-b405-7f98c4c95f5f" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_724ab96a-9313-4eaf-811b-787cacc2d453" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_57e3466e-e249-4b9e-abc6-774cda9ab22f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_26b103e5-73c8-42ff-b405-7f98c4c95f5f" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_57e3466e-e249-4b9e-abc6-774cda9ab22f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_6810ddec-f20c-4ee0-9b14-6c4841a3e737" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_881cc639-8523-44a8-b285-b395d7d961a9" xlink:to="loc_us-gaap_StatementTable_6810ddec-f20c-4ee0-9b14-6c4841a3e737" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_f58f31e3-9ca5-4260-b505-375d1ad6cdae" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_6810ddec-f20c-4ee0-9b14-6c4841a3e737" xlink:to="loc_us-gaap_StatementClassOfStockAxis_f58f31e3-9ca5-4260-b505-375d1ad6cdae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_f58f31e3-9ca5-4260-b505-375d1ad6cdae_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_f58f31e3-9ca5-4260-b505-375d1ad6cdae" xlink:to="loc_us-gaap_ClassOfStockDomain_f58f31e3-9ca5-4260-b505-375d1ad6cdae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_96257773-ef4e-47cd-b064-ef619a81028d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_f58f31e3-9ca5-4260-b505-375d1ad6cdae" xlink:to="loc_us-gaap_ClassOfStockDomain_96257773-ef4e-47cd-b064-ef619a81028d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CommonClassAAndBMember_b655bd22-fe9d-4d11-811f-1ff72cbaa567" xlink:href="crwd-20201031.xsd#crwd_CommonClassAAndBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_96257773-ef4e-47cd-b064-ef619a81028d" xlink:to="loc_crwd_CommonClassAAndBMember_b655bd22-fe9d-4d11-811f-1ff72cbaa567" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_7ecfe82a-fa8d-40e9-ae46-aecbb591289f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_96257773-ef4e-47cd-b064-ef619a81028d" xlink:to="loc_us-gaap_CommonClassAMember_7ecfe82a-fa8d-40e9-ae46-aecbb591289f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_0ea6a4c8-b54f-4607-b68d-50f0a9cf449d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_96257773-ef4e-47cd-b064-ef619a81028d" xlink:to="loc_us-gaap_CommonClassBMember_0ea6a4c8-b54f-4607-b68d-50f0a9cf449d" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" xlink:href="crwd-20201031.xsd#CondensedConsolidatedBalanceSheetsParenthetical"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended" id="icc5f4e7f1e0140caa047cabe4e74c098_CondensedConsolidatedBalanceSheetsParenthetical">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_7d858bb0-49ec-45a7-b746-4827ba684b0c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_43ff60c4-80df-46dc-81b0-d6cc61557f46" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7d858bb0-49ec-45a7-b746-4827ba684b0c" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_43ff60c4-80df-46dc-81b0-d6cc61557f46" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_759cb9b3-d9a5-4188-970d-0a20479759c2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7d858bb0-49ec-45a7-b746-4827ba684b0c" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_759cb9b3-d9a5-4188-970d-0a20479759c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_637fe9ea-b652-4e59-9f93-d49c66a5c382" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7d858bb0-49ec-45a7-b746-4827ba684b0c" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_637fe9ea-b652-4e59-9f93-d49c66a5c382" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_87ca308c-1a42-4af3-a580-8b69551e81c0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7d858bb0-49ec-45a7-b746-4827ba684b0c" xlink:to="loc_us-gaap_PreferredStockSharesIssued_87ca308c-1a42-4af3-a580-8b69551e81c0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_af1e9eb2-486d-4543-9b5f-4e84ff9011bc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7d858bb0-49ec-45a7-b746-4827ba684b0c" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_af1e9eb2-486d-4543-9b5f-4e84ff9011bc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_a87c3091-96f6-443c-80a1-2cc058d620b3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7d858bb0-49ec-45a7-b746-4827ba684b0c" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_a87c3091-96f6-443c-80a1-2cc058d620b3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_fb29f400-9fd1-4fe1-b822-90c797b4afe7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7d858bb0-49ec-45a7-b746-4827ba684b0c" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_fb29f400-9fd1-4fe1-b822-90c797b4afe7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_1830df15-e9bb-44d5-8d5d-eb7323dc15d3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7d858bb0-49ec-45a7-b746-4827ba684b0c" xlink:to="loc_us-gaap_CommonStockSharesIssued_1830df15-e9bb-44d5-8d5d-eb7323dc15d3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_8b7d0963-4dc7-48fb-ab84-a8739924b743" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_7d858bb0-49ec-45a7-b746-4827ba684b0c" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_8b7d0963-4dc7-48fb-ab84-a8739924b743" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_c62d35c9-05ad-4b92-bb28-bddc71dcb1a4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_7d858bb0-49ec-45a7-b746-4827ba684b0c" xlink:to="loc_us-gaap_StatementTable_c62d35c9-05ad-4b92-bb28-bddc71dcb1a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_b1a64784-f851-45b0-a149-7924a813522a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_c62d35c9-05ad-4b92-bb28-bddc71dcb1a4" xlink:to="loc_us-gaap_StatementClassOfStockAxis_b1a64784-f851-45b0-a149-7924a813522a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_b1a64784-f851-45b0-a149-7924a813522a_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_b1a64784-f851-45b0-a149-7924a813522a" xlink:to="loc_us-gaap_ClassOfStockDomain_b1a64784-f851-45b0-a149-7924a813522a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_4f7fab68-ca47-4ff6-a45b-fac5327d5a4f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_b1a64784-f851-45b0-a149-7924a813522a" xlink:to="loc_us-gaap_ClassOfStockDomain_4f7fab68-ca47-4ff6-a45b-fac5327d5a4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_5dd0657d-68fc-4b4d-942c-f38d1e5202fd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_4f7fab68-ca47-4ff6-a45b-fac5327d5a4f" xlink:to="loc_us-gaap_CommonClassAMember_5dd0657d-68fc-4b4d-942c-f38d1e5202fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_f66fbecc-83b6-4ef0-86f1-b36a99d519c1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_4f7fab68-ca47-4ff6-a45b-fac5327d5a4f" xlink:to="loc_us-gaap_CommonClassBMember_f66fbecc-83b6-4ef0-86f1-b36a99d519c1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofOperations" xlink:type="simple" xlink:href="crwd-20201031.xsd#CondensedConsolidatedStatementsofOperations"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofOperations" xlink:type="extended" id="i2c1887f663f5430b87e68f410fd3a363_CondensedConsolidatedStatementsofOperations">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_40ade8bd-8c41-4594-a6de-505b513b8896" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:to="loc_us-gaap_RevenuesAbstract_40ade8bd-8c41-4594-a6de-505b513b8896" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_5962fa5f-55a9-49ac-b47c-fd08ff89852f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_40ade8bd-8c41-4594-a6de-505b513b8896" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_5962fa5f-55a9-49ac-b47c-fd08ff89852f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfRevenueAbstract_932108d3-9f06-483e-b739-0658291a7a8c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfRevenueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:to="loc_us-gaap_CostOfRevenueAbstract_932108d3-9f06-483e-b739-0658291a7a8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_645a1721-acfd-4056-a5a7-6d7de65561cd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostOfRevenueAbstract_932108d3-9f06-483e-b739-0658291a7a8c" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_645a1721-acfd-4056-a5a7-6d7de65561cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_83d35d39-af01-40a2-98cf-7e11a1e68d32" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:to="loc_us-gaap_GrossProfit_83d35d39-af01-40a2-98cf-7e11a1e68d32" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_8f52a513-115a-4eb3-8f04-956d5f5368c6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:to="loc_us-gaap_OperatingExpensesAbstract_8f52a513-115a-4eb3-8f04-956d5f5368c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpense_7947c3bc-9de6-4b08-a88d-d2cf8941a35d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingAndMarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_8f52a513-115a-4eb3-8f04-956d5f5368c6" xlink:to="loc_us-gaap_SellingAndMarketingExpense_7947c3bc-9de6-4b08-a88d-d2cf8941a35d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpense_9167375f-7bf6-46ac-88be-a3f53e238292" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_8f52a513-115a-4eb3-8f04-956d5f5368c6" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpense_9167375f-7bf6-46ac-88be-a3f53e238292" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_7d5b1f29-e204-46af-9e0f-c454b64d17de" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_8f52a513-115a-4eb3-8f04-956d5f5368c6" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_7d5b1f29-e204-46af-9e0f-c454b64d17de" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_97ec0a52-637f-4013-b407-d1ffc5425c1e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_8f52a513-115a-4eb3-8f04-956d5f5368c6" xlink:to="loc_us-gaap_OperatingExpenses_97ec0a52-637f-4013-b407-d1ffc5425c1e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_3b8844d2-f527-4b2a-945b-5eea8176e0af" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:to="loc_us-gaap_OperatingIncomeLoss_3b8844d2-f527-4b2a-945b-5eea8176e0af" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_2896a127-c1bb-46db-8251-3a2dbe063916" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:to="loc_us-gaap_InterestExpense_2896a127-c1bb-46db-8251-3a2dbe063916" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_ecd0f10b-ec09-41f4-ad5f-71f931428bf4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_ecd0f10b-ec09-41f4-ad5f-71f931428bf4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_dc535cf3-ec51-493d-baab-631f8a67e8a4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_dc535cf3-ec51-493d-baab-631f8a67e8a4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_7724dc40-b33a-42a8-b382-be20ca7370ec" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_7724dc40-b33a-42a8-b382-be20ca7370ec" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_4654762d-24c5-4672-aa4f-1e24f65aa155" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:to="loc_us-gaap_NetIncomeLoss_4654762d-24c5-4672-aa4f-1e24f65aa155" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDiluted_eee8cd48-2ff1-45f1-a8a6-1f9f7d6aa334" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:to="loc_us-gaap_EarningsPerShareBasicAndDiluted_eee8cd48-2ff1-45f1-a8a6-1f9f7d6aa334" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_0cdac943-0208-4937-bf5f-a34d27296515" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:to="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_0cdac943-0208-4937-bf5f-a34d27296515" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_b1dccc68-75b8-4817-9722-91a92ae186f5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_e35f1ad6-2fcf-4ea7-aefb-ef86b3f20d3b" xlink:to="loc_us-gaap_StatementTable_b1dccc68-75b8-4817-9722-91a92ae186f5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_6a8eb729-fc45-4add-bb8e-cd7bd45a1513" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_b1dccc68-75b8-4817-9722-91a92ae186f5" xlink:to="loc_srt_ProductOrServiceAxis_6a8eb729-fc45-4add-bb8e-cd7bd45a1513" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_6a8eb729-fc45-4add-bb8e-cd7bd45a1513_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_6a8eb729-fc45-4add-bb8e-cd7bd45a1513" xlink:to="loc_srt_ProductsAndServicesDomain_6a8eb729-fc45-4add-bb8e-cd7bd45a1513_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_77b4afc8-01b4-4cb2-9c28-002296bb60a8" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_6a8eb729-fc45-4add-bb8e-cd7bd45a1513" xlink:to="loc_srt_ProductsAndServicesDomain_77b4afc8-01b4-4cb2-9c28-002296bb60a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubscriptionAndCirculationMember_ee1425b7-fdfc-4efd-97fd-50c80ce922e4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubscriptionAndCirculationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_77b4afc8-01b4-4cb2-9c28-002296bb60a8" xlink:to="loc_us-gaap_SubscriptionAndCirculationMember_ee1425b7-fdfc-4efd-97fd-50c80ce922e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ProfessionalServicesMember_e452c0c0-722e-4af9-b388-3e9765ba6f35" xlink:href="crwd-20201031.xsd#crwd_ProfessionalServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_77b4afc8-01b4-4cb2-9c28-002296bb60a8" xlink:to="loc_crwd_ProfessionalServicesMember_e452c0c0-722e-4af9-b388-3e9765ba6f35" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofComprehensiveLoss" xlink:type="simple" xlink:href="crwd-20201031.xsd#CondensedConsolidatedStatementsofComprehensiveLoss"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofComprehensiveLoss" xlink:type="extended" id="i3bc0b6a078644bc892061f2f4a5e94ce_CondensedConsolidatedStatementsofComprehensiveLoss"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofRedeemableConvertiblePreferredStockandStockholdersEquity" xlink:type="simple" xlink:href="crwd-20201031.xsd#CondensedConsolidatedStatementsofRedeemableConvertiblePreferredStockandStockholdersEquity"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofRedeemableConvertiblePreferredStockandStockholdersEquity" xlink:type="extended" id="ibde4f343992f4b628b56d14591a10e96_CondensedConsolidatedStatementsofRedeemableConvertiblePreferredStockandStockholdersEquity">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_907aad73-0118-469a-9b49-7b26ece72138" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_007a1e8d-9dc6-40fe-97ac-979972f9f129" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInTemporaryEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_907aad73-0118-469a-9b49-7b26ece72138" xlink:to="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_007a1e8d-9dc6-40fe-97ac-979972f9f129" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_cc8ffe21-07d8-403d-9190-9ebba3b0dcc9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_007a1e8d-9dc6-40fe-97ac-979972f9f129" xlink:to="loc_us-gaap_TemporaryEquitySharesOutstanding_cc8ffe21-07d8-403d-9190-9ebba3b0dcc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_d019a222-c10b-42f8-b30e-2fbce92074b0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_007a1e8d-9dc6-40fe-97ac-979972f9f129" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_d019a222-c10b-42f8-b30e-2fbce92074b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_TemporaryEquityStockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_59f8d3b4-052e-4a6a-9d49-256941a45eb7" xlink:href="crwd-20201031.xsd#crwd_TemporaryEquityStockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_007a1e8d-9dc6-40fe-97ac-979972f9f129" xlink:to="loc_crwd_TemporaryEquityStockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_59f8d3b4-052e-4a6a-9d49-256941a45eb7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_TemporaryEquityStockIssuedDuringPeriodValueConversionOfConvertibleSecurities_b93f546c-e090-468c-9f4e-d77404fb886d" xlink:href="crwd-20201031.xsd#crwd_TemporaryEquityStockIssuedDuringPeriodValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_007a1e8d-9dc6-40fe-97ac-979972f9f129" xlink:to="loc_crwd_TemporaryEquityStockIssuedDuringPeriodValueConversionOfConvertibleSecurities_b93f546c-e090-468c-9f4e-d77404fb886d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_c27f5f7a-381a-42f4-82a0-2ec1171ff822" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_8983455c-694e-4931-80d0-89621dc13d4b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_907aad73-0118-469a-9b49-7b26ece72138" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_765a3f64-cf89-4feb-8027-d418b3f8d936" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_SharesOutstanding_765a3f64-cf89-4feb-8027-d418b3f8d936" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_4ca0f423-31b1-40c1-bd26-2ad8e655048f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_4ca0f423-31b1-40c1-bd26-2ad8e655048f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_2ee94bbf-a0b5-4090-87b2-d970eb2d02b3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_StockholdersEquity_2ee94bbf-a0b5-4090-87b2-d970eb2d02b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_2b6d5d67-9604-4a85-94b7-ec2040e904c5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_2b6d5d67-9604-4a85-94b7-ec2040e904c5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_8e63870d-e979-426b-a1fe-cb7fb02275b5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_8e63870d-e979-426b-a1fe-cb7fb02275b5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_076aaed1-9505-4877-a114-5ccd10e186b3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_076aaed1-9505-4877-a114-5ccd10e186b3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_6ee904d8-85e9-4943-8311-469dc38f2a81" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_6ee904d8-85e9-4943-8311-469dc38f2a81" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock_2e03cbd3-9abb-48ad-bf3c-bfbe7eae63ef" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalIncreaseInCarryingAmountOfRedeemablePreferredStock_2e03cbd3-9abb-48ad-bf3c-bfbe7eae63ef" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockAndWarrantsIssuedDuringPeriodSharesPreferredStockAndWarrants_e2cc7465-2f30-4abc-9120-c6a59003fcab" xlink:href="crwd-20201031.xsd#crwd_StockAndWarrantsIssuedDuringPeriodSharesPreferredStockAndWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_crwd_StockAndWarrantsIssuedDuringPeriodSharesPreferredStockAndWarrants_e2cc7465-2f30-4abc-9120-c6a59003fcab" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_8a5a1fca-f933-4a06-8148-b9f51c62b0cc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_8a5a1fca-f933-4a06-8148-b9f51c62b0cc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_d5d3bab9-ef7b-4980-82fc-ddd5aeef9b0f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_d5d3bab9-ef7b-4980-82fc-ddd5aeef9b0f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockIssuedDuringPeriodSharesRSURelease_7709861f-be34-42ba-bbc1-1d797a331a8d" xlink:href="crwd-20201031.xsd#crwd_StockIssuedDuringPeriodSharesRSURelease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_crwd_StockIssuedDuringPeriodSharesRSURelease_7709861f-be34-42ba-bbc1-1d797a331a8d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockIssuedDuringPeriodValueRSURelease_664c2f66-019f-488e-ac34-51cd4fdff97c" xlink:href="crwd-20201031.xsd#crwd_StockIssuedDuringPeriodValueRSURelease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_crwd_StockIssuedDuringPeriodValueRSURelease_664c2f66-019f-488e-ac34-51cd4fdff97c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_53e785d8-0279-4496-9f3d-45faac5ef4c4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_53e785d8-0279-4496-9f3d-45faac5ef4c4" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_837d069f-bfcf-41ae-833f-46af7da1f9f7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_837d069f-bfcf-41ae-833f-46af7da1f9f7" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockIssuedDuringPeriodSharesEarlyStockOptionsExercised_05b06e6f-1f55-4831-bcb0-dd9f83d74478" xlink:href="crwd-20201031.xsd#crwd_StockIssuedDuringPeriodSharesEarlyStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_crwd_StockIssuedDuringPeriodSharesEarlyStockOptionsExercised_05b06e6f-1f55-4831-bcb0-dd9f83d74478" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationVestingOfEarlyExercisedOptions_3358b227-752d-4c83-811f-5b0bb090c38b" xlink:href="crwd-20201031.xsd#crwd_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationVestingOfEarlyExercisedOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_crwd_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationVestingOfEarlyExercisedOptions_3358b227-752d-4c83-811f-5b0bb090c38b" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_3aeee88d-34ea-4aab-a0d1-2c599bfd8457" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_3aeee88d-34ea-4aab-a0d1-2c599bfd8457" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_AdjustmentsToAdditionalPaidInCapitalCapitalizedShareBasedCompensationRequisiteServicePeriodRecognitionValue_8975fcdb-10a1-4bc8-bd21-9007fc8adcec" xlink:href="crwd-20201031.xsd#crwd_AdjustmentsToAdditionalPaidInCapitalCapitalizedShareBasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_crwd_AdjustmentsToAdditionalPaidInCapitalCapitalizedShareBasedCompensationRequisiteServicePeriodRecognitionValue_8975fcdb-10a1-4bc8-bd21-9007fc8adcec" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_AdjustmentsToAdditionalPaidInCapitalFairValueOfReplacementEquityAwardsAttributableToPreAcquisitionService_9132fe43-54d1-484e-8929-2fe3b3ffa8e9" xlink:href="crwd-20201031.xsd#crwd_AdjustmentsToAdditionalPaidInCapitalFairValueOfReplacementEquityAwardsAttributableToPreAcquisitionService"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_crwd_AdjustmentsToAdditionalPaidInCapitalFairValueOfReplacementEquityAwardsAttributableToPreAcquisitionService_9132fe43-54d1-484e-8929-2fe3b3ffa8e9" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_d9124107-c3ad-4495-94b6-9d1ec33ecdab" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_NetIncomeLoss_d9124107-c3ad-4495-94b6-9d1ec33ecdab" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_NoncontrollingInterestIncreaseFromContribution_6d58666b-b586-4fae-a5fb-0c29a8fb75ac" xlink:href="crwd-20201031.xsd#crwd_NoncontrollingInterestIncreaseFromContribution"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_crwd_NoncontrollingInterestIncreaseFromContribution_6d58666b-b586-4fae-a5fb-0c29a8fb75ac" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_bdc34ac3-ba75-4c26-a0a7-32501ce72991" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_8485f25e-6a6e-4b80-9091-e9ca15c8ae08" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_bdc34ac3-ba75-4c26-a0a7-32501ce72991" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesOutstanding_9d88215d-8339-46a4-a8e7-41ab4113d9a7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_a279af22-0b22-4185-8e99-b925ed870361" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_16be5359-ac28-4066-b020-310debee6cef" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_deb81b9b-afed-4d2c-9202-1ed4b793e5af" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_907aad73-0118-469a-9b49-7b26ece72138" xlink:to="loc_us-gaap_StatementTable_deb81b9b-afed-4d2c-9202-1ed4b793e5af" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_eb196bc1-ad70-4160-8654-623885ca292e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_deb81b9b-afed-4d2c-9202-1ed4b793e5af" xlink:to="loc_us-gaap_StatementClassOfStockAxis_eb196bc1-ad70-4160-8654-623885ca292e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_eb196bc1-ad70-4160-8654-623885ca292e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_eb196bc1-ad70-4160-8654-623885ca292e" xlink:to="loc_us-gaap_ClassOfStockDomain_eb196bc1-ad70-4160-8654-623885ca292e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_b52e43ae-0720-4888-b3ae-73fb0e51240f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_eb196bc1-ad70-4160-8654-623885ca292e" xlink:to="loc_us-gaap_ClassOfStockDomain_b52e43ae-0720-4888-b3ae-73fb0e51240f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RedeemableConvertiblePreferredStockMember_aa0b6962-0d87-4d4e-8ddc-291d8a603241" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RedeemableConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_b52e43ae-0720-4888-b3ae-73fb0e51240f" xlink:to="loc_us-gaap_RedeemableConvertiblePreferredStockMember_aa0b6962-0d87-4d4e-8ddc-291d8a603241" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_7a48db20-b3c0-46f6-be92-0b1af02b3c0d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_deb81b9b-afed-4d2c-9202-1ed4b793e5af" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_7a48db20-b3c0-46f6-be92-0b1af02b3c0d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_7a48db20-b3c0-46f6-be92-0b1af02b3c0d_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_7a48db20-b3c0-46f6-be92-0b1af02b3c0d" xlink:to="loc_us-gaap_EquityComponentDomain_7a48db20-b3c0-46f6-be92-0b1af02b3c0d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_2b2e9c8d-1537-4f38-9d0d-23a8594b90f0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_7a48db20-b3c0-46f6-be92-0b1af02b3c0d" xlink:to="loc_us-gaap_EquityComponentDomain_2b2e9c8d-1537-4f38-9d0d-23a8594b90f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_f71c905e-573d-4d5e-bccb-8236ed49cf0f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2b2e9c8d-1537-4f38-9d0d-23a8594b90f0" xlink:to="loc_us-gaap_CommonStockMember_f71c905e-573d-4d5e-bccb-8236ed49cf0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_58a4a5ee-f702-4c53-b0e2-ba0c053cc2ea" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2b2e9c8d-1537-4f38-9d0d-23a8594b90f0" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_58a4a5ee-f702-4c53-b0e2-ba0c053cc2ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_c631bca5-8374-4b7d-8b1a-2774ef141090" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2b2e9c8d-1537-4f38-9d0d-23a8594b90f0" xlink:to="loc_us-gaap_RetainedEarningsMember_c631bca5-8374-4b7d-8b1a-2774ef141090" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_e223a9a4-4912-4aa8-8515-c38b767fac54" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2b2e9c8d-1537-4f38-9d0d-23a8594b90f0" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_e223a9a4-4912-4aa8-8515-c38b767fac54" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_d9c940c2-357d-4875-9239-d08651c65559" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_2b2e9c8d-1537-4f38-9d0d-23a8594b90f0" xlink:to="loc_us-gaap_NoncontrollingInterestMember_d9c940c2-357d-4875-9239-d08651c65559" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_314cb25f-09df-4036-ac21-44a671e01020" xlink:href="crwd-20201031.xsd#crwd_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_deb81b9b-afed-4d2c-9202-1ed4b793e5af" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_314cb25f-09df-4036-ac21-44a671e01020" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_314cb25f-09df-4036-ac21-44a671e01020_default" xlink:href="crwd-20201031.xsd#crwd_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_314cb25f-09df-4036-ac21-44a671e01020" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_314cb25f-09df-4036-ac21-44a671e01020_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_3f1b3f26-0ead-4cce-82c4-a0502709681c" xlink:href="crwd-20201031.xsd#crwd_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_314cb25f-09df-4036-ac21-44a671e01020" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_3f1b3f26-0ead-4cce-82c4-a0502709681c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember_f0d15c6c-c88a-493a-850a-da73580929f6" xlink:href="crwd-20201031.xsd#crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_3f1b3f26-0ead-4cce-82c4-a0502709681c" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember_f0d15c6c-c88a-493a-850a-da73580929f6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="crwd-20201031.xsd#CondensedConsolidatedStatementsofCashFlows"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CondensedConsolidatedStatementsofCashFlows" xlink:type="extended" id="id313c0f33d7d4a33b849b7b77a8b7da3_CondensedConsolidatedStatementsofCashFlows"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/DescriptionofBusinessandBasisofPresentation" xlink:type="simple" xlink:href="crwd-20201031.xsd#DescriptionofBusinessandBasisofPresentation"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/DescriptionofBusinessandBasisofPresentation" xlink:type="extended" id="i291c54953a004b9b9b18b19a8c7bc940_DescriptionofBusinessandBasisofPresentation"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/DescriptionofBusinessandBasisofPresentationDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#DescriptionofBusinessandBasisofPresentationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/DescriptionofBusinessandBasisofPresentationDetails" xlink:type="extended" id="ib395315a5da84a66af846ded06df3d85_DescriptionofBusinessandBasisofPresentationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_15945a40-3650-4431-9f21-6ac42cba87d4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_NumberOfCloudModules_77733bcb-a4e8-4e48-b395-2470dc634842" xlink:href="crwd-20201031.xsd#crwd_NumberOfCloudModules"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_15945a40-3650-4431-9f21-6ac42cba87d4" xlink:to="loc_crwd_NumberOfCloudModules_77733bcb-a4e8-4e48-b395-2470dc634842" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_0a89e8ad-f334-4b10-a722-c3dfd1a08f31" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_15945a40-3650-4431-9f21-6ac42cba87d4" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_0a89e8ad-f334-4b10-a722-c3dfd1a08f31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharePrice_e54582ed-c91d-4201-93dd-b615e5b7ebaa" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_15945a40-3650-4431-9f21-6ac42cba87d4" xlink:to="loc_us-gaap_SharePrice_e54582ed-c91d-4201-93dd-b615e5b7ebaa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceInitialPublicOffering_70cdd24f-4b6b-4a07-b1df-66e84c8401e4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProceedsFromIssuanceInitialPublicOffering"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_15945a40-3650-4431-9f21-6ac42cba87d4" xlink:to="loc_us-gaap_ProceedsFromIssuanceInitialPublicOffering_70cdd24f-4b6b-4a07-b1df-66e84c8401e4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PaymentsOfUnderwritersDiscountsAndCommissions_0d44f0bf-0523-45ad-bad8-5d5fcb08da84" xlink:href="crwd-20201031.xsd#crwd_PaymentsOfUnderwritersDiscountsAndCommissions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_15945a40-3650-4431-9f21-6ac42cba87d4" xlink:to="loc_crwd_PaymentsOfUnderwritersDiscountsAndCommissions_0d44f0bf-0523-45ad-bad8-5d5fcb08da84" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConversionOfStockSharesIssued1_fb5e0f62-2d23-4cc6-8a92-fea53aa54e47" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConversionOfStockSharesIssued1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_15945a40-3650-4431-9f21-6ac42cba87d4" xlink:to="loc_us-gaap_ConversionOfStockSharesIssued1_fb5e0f62-2d23-4cc6-8a92-fea53aa54e47" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockConversionCommonStockConversionRatio_6e8a7942-9eff-4276-8ffa-32d3101d76be" xlink:href="crwd-20201031.xsd#crwd_StockConversionCommonStockConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_15945a40-3650-4431-9f21-6ac42cba87d4" xlink:to="loc_crwd_StockConversionCommonStockConversionRatio_6e8a7942-9eff-4276-8ffa-32d3101d76be" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ConversionOfWarrantsWarrantsIssued_ef068888-11c2-449b-a053-4ae8e5e5f0d7" xlink:href="crwd-20201031.xsd#crwd_ConversionOfWarrantsWarrantsIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_15945a40-3650-4431-9f21-6ac42cba87d4" xlink:to="loc_crwd_ConversionOfWarrantsWarrantsIssued_ef068888-11c2-449b-a053-4ae8e5e5f0d7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockConversionWarrantsConversionRatio_14a7e020-29f7-4f0a-8f81-d5a03961d805" xlink:href="crwd-20201031.xsd#crwd_StockConversionWarrantsConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_15945a40-3650-4431-9f21-6ac42cba87d4" xlink:to="loc_crwd_StockConversionWarrantsConversionRatio_14a7e020-29f7-4f0a-8f81-d5a03961d805" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_aeabef73-5186-4f0a-8dd7-43929d07487c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_15945a40-3650-4431-9f21-6ac42cba87d4" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_aeabef73-5186-4f0a-8dd7-43929d07487c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_50445a95-7cdd-4ea0-a2d6-7bae0835942c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_aeabef73-5186-4f0a-8dd7-43929d07487c" xlink:to="loc_us-gaap_StatementClassOfStockAxis_50445a95-7cdd-4ea0-a2d6-7bae0835942c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_50445a95-7cdd-4ea0-a2d6-7bae0835942c_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_50445a95-7cdd-4ea0-a2d6-7bae0835942c" xlink:to="loc_us-gaap_ClassOfStockDomain_50445a95-7cdd-4ea0-a2d6-7bae0835942c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_54d54614-6923-40ec-a90a-104df8b09798" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_50445a95-7cdd-4ea0-a2d6-7bae0835942c" xlink:to="loc_us-gaap_ClassOfStockDomain_54d54614-6923-40ec-a90a-104df8b09798" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_7af71d24-7b46-4ece-84e1-9d950ad61702" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_54d54614-6923-40ec-a90a-104df8b09798" xlink:to="loc_us-gaap_CommonClassAMember_7af71d24-7b46-4ece-84e1-9d950ad61702" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_b45c71e6-33b3-45d8-ba94-ffe227491823" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_54d54614-6923-40ec-a90a-104df8b09798" xlink:to="loc_us-gaap_CommonClassBMember_b45c71e6-33b3-45d8-ba94-ffe227491823" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_be0efe19-c017-4309-a431-9b94d57d9660" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_aeabef73-5186-4f0a-8dd7-43929d07487c" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_be0efe19-c017-4309-a431-9b94d57d9660" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_be0efe19-c017-4309-a431-9b94d57d9660_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_be0efe19-c017-4309-a431-9b94d57d9660" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_be0efe19-c017-4309-a431-9b94d57d9660_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_e3e85811-511b-4d6e-8bd5-8e985bc37f0b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_be0efe19-c017-4309-a431-9b94d57d9660" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_e3e85811-511b-4d6e-8bd5-8e985bc37f0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IPOMember_981fa925-ff50-44fd-933d-0d51f76d42a0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IPOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_e3e85811-511b-4d6e-8bd5-8e985bc37f0b" xlink:to="loc_us-gaap_IPOMember_981fa925-ff50-44fd-933d-0d51f76d42a0" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPolicies" xlink:type="simple" xlink:href="crwd-20201031.xsd#SummaryofSignificantAccountingPolicies"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPolicies" xlink:type="extended" id="i58a2b647ed4f42c6b6c6f0d96d953caa_SummaryofSignificantAccountingPolicies"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesPolicies" xlink:type="simple" xlink:href="crwd-20201031.xsd#SummaryofSignificantAccountingPoliciesPolicies"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesPolicies" xlink:type="extended" id="i8c3c12f60a9f49a38fb93facc5c7de45_SummaryofSignificantAccountingPoliciesPolicies"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesTables" xlink:type="simple" xlink:href="crwd-20201031.xsd#SummaryofSignificantAccountingPoliciesTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesTables" xlink:type="extended" id="i2fe34243fbb1428b8f7d2f54d2df1c15_SummaryofSignificantAccountingPoliciesTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#SummaryofSignificantAccountingPoliciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesNarrativeDetails" xlink:type="extended" id="id19625947a744f1880c668969a32aebc_SummaryofSignificantAccountingPoliciesNarrativeDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_87574357-da17-462b-adad-b343d116d731" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_NumberOfMarketableSecuritiesHeld_ccb54fa4-be1e-41f6-bc40-415d16af9a53" xlink:href="crwd-20201031.xsd#crwd_NumberOfMarketableSecuritiesHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_87574357-da17-462b-adad-b343d116d731" xlink:to="loc_crwd_NumberOfMarketableSecuritiesHeld_ccb54fa4-be1e-41f6-bc40-415d16af9a53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_6eae9c8e-ec35-4212-8577-6096a5e81d7e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_87574357-da17-462b-adad-b343d116d731" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_6eae9c8e-ec35-4212-8577-6096a5e81d7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_7973536d-cedc-40f3-81ef-95d4508d98f5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_87574357-da17-462b-adad-b343d116d731" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_7973536d-cedc-40f3-81ef-95d4508d98f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_08f44f40-134c-4151-bc20-1d9ba9396f89" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_87574357-da17-462b-adad-b343d116d731" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_08f44f40-134c-4151-bc20-1d9ba9396f89" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_cfe4adfe-1bb9-4ae9-8e2a-7895e8cb51cd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_87574357-da17-462b-adad-b343d116d731" xlink:to="loc_us-gaap_OperatingLeaseLiability_cfe4adfe-1bb9-4ae9-8e2a-7895e8cb51cd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_8416bb90-8205-44b2-b8cf-4052afead5f4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_87574357-da17-462b-adad-b343d116d731" xlink:to="loc_us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding_8416bb90-8205-44b2-b8cf-4052afead5f4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_c680ab2f-d8b9-46f4-a571-2d16bb69bb44" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_87574357-da17-462b-adad-b343d116d731" xlink:to="loc_us-gaap_ConcentrationRiskTable_c680ab2f-d8b9-46f4-a571-2d16bb69bb44" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_3de74bbd-14e7-4ad7-8255-2773bddc4aaf" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_c680ab2f-d8b9-46f4-a571-2d16bb69bb44" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_3de74bbd-14e7-4ad7-8255-2773bddc4aaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_3de74bbd-14e7-4ad7-8255-2773bddc4aaf_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_3de74bbd-14e7-4ad7-8255-2773bddc4aaf" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_3de74bbd-14e7-4ad7-8255-2773bddc4aaf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_67d13c7b-d36a-40d5-a3d2-f144931ef3ba" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_3de74bbd-14e7-4ad7-8255-2773bddc4aaf" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_67d13c7b-d36a-40d5-a3d2-f144931ef3ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesMember_f8df202d-9f65-43fe-8770-2e8229194f25" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_67d13c7b-d36a-40d5-a3d2-f144931ef3ba" xlink:to="loc_us-gaap_OtherLiabilitiesMember_f8df202d-9f65-43fe-8770-2e8229194f25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_48254332-21fb-4934-b969-4125e434862c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_c680ab2f-d8b9-46f4-a571-2d16bb69bb44" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_48254332-21fb-4934-b969-4125e434862c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_48254332-21fb-4934-b969-4125e434862c_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_48254332-21fb-4934-b969-4125e434862c" xlink:to="loc_us-gaap_TypeOfAdoptionMember_48254332-21fb-4934-b969-4125e434862c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_5a7e8eb3-4a04-4a74-95bc-142807a00993" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_48254332-21fb-4934-b969-4125e434862c" xlink:to="loc_us-gaap_TypeOfAdoptionMember_5a7e8eb3-4a04-4a74-95bc-142807a00993" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate201602Member_5d06f0ad-f8c3-4f38-80bc-ed56812ee18c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingStandardsUpdate201602Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_5a7e8eb3-4a04-4a74-95bc-142807a00993" xlink:to="loc_us-gaap_AccountingStandardsUpdate201602Member_5d06f0ad-f8c3-4f38-80bc-ed56812ee18c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_d7fc1f52-1fe7-4fa6-92e2-7bbeae9c013f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_c680ab2f-d8b9-46f4-a571-2d16bb69bb44" xlink:to="loc_us-gaap_CreditFacilityAxis_d7fc1f52-1fe7-4fa6-92e2-7bbeae9c013f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_d7fc1f52-1fe7-4fa6-92e2-7bbeae9c013f_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_d7fc1f52-1fe7-4fa6-92e2-7bbeae9c013f" xlink:to="loc_us-gaap_CreditFacilityDomain_d7fc1f52-1fe7-4fa6-92e2-7bbeae9c013f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_953ea3fd-88b2-45fa-8b85-c94b143c2185" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_d7fc1f52-1fe7-4fa6-92e2-7bbeae9c013f" xlink:to="loc_us-gaap_CreditFacilityDomain_953ea3fd-88b2-45fa-8b85-c94b143c2185" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_4fb488e3-aae7-4706-801f-fa48166a4ee1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_953ea3fd-88b2-45fa-8b85-c94b143c2185" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_4fb488e3-aae7-4706-801f-fa48166a4ee1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_cf86be4e-b793-4a97-b28a-3379e7b6f7d4" xlink:href="crwd-20201031.xsd#crwd_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_c680ab2f-d8b9-46f4-a571-2d16bb69bb44" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_cf86be4e-b793-4a97-b28a-3379e7b6f7d4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_cf86be4e-b793-4a97-b28a-3379e7b6f7d4_default" xlink:href="crwd-20201031.xsd#crwd_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_cf86be4e-b793-4a97-b28a-3379e7b6f7d4" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_cf86be4e-b793-4a97-b28a-3379e7b6f7d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_ec00a8a9-b89e-45b0-9f19-3cf3be6d386f" xlink:href="crwd-20201031.xsd#crwd_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_cf86be4e-b793-4a97-b28a-3379e7b6f7d4" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_ec00a8a9-b89e-45b0-9f19-3cf3be6d386f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember_479e790f-8f07-4605-bd5f-e67a04bd5fd8" xlink:href="crwd-20201031.xsd#crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_ec00a8a9-b89e-45b0-9f19-3cf3be6d386f" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember_479e790f-8f07-4605-bd5f-e67a04bd5fd8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesConcentrationofCreditRiskDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#SummaryofSignificantAccountingPoliciesConcentrationofCreditRiskDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SummaryofSignificantAccountingPoliciesConcentrationofCreditRiskDetails" xlink:type="extended" id="i9c1f4990e26a497490a04faa65cf6d84_SummaryofSignificantAccountingPoliciesConcentrationofCreditRiskDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_d7d54b24-2a7b-4747-a004-2f1eb9f7ab20" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_6e45894b-8290-44e5-8c9b-6e3c1c79753c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_d7d54b24-2a7b-4747-a004-2f1eb9f7ab20" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_6e45894b-8290-44e5-8c9b-6e3c1c79753c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_48dda356-d85f-4830-a0ff-56daa768f405" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_d7d54b24-2a7b-4747-a004-2f1eb9f7ab20" xlink:to="loc_us-gaap_ConcentrationRiskTable_48dda356-d85f-4830-a0ff-56daa768f405" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_39f84728-7dc5-4913-851c-3fa297057dd7" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_48dda356-d85f-4830-a0ff-56daa768f405" xlink:to="loc_srt_MajorCustomersAxis_39f84728-7dc5-4913-851c-3fa297057dd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_39f84728-7dc5-4913-851c-3fa297057dd7_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_39f84728-7dc5-4913-851c-3fa297057dd7" xlink:to="loc_srt_NameOfMajorCustomerDomain_39f84728-7dc5-4913-851c-3fa297057dd7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_9f1b5362-93a3-45bb-8aff-4dccf61b10c8" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_39f84728-7dc5-4913-851c-3fa297057dd7" xlink:to="loc_srt_NameOfMajorCustomerDomain_9f1b5362-93a3-45bb-8aff-4dccf61b10c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ChannelPartnerAMember_2f53f7a3-dc8c-4d4b-ad5d-491de08e73b2" xlink:href="crwd-20201031.xsd#crwd_ChannelPartnerAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_9f1b5362-93a3-45bb-8aff-4dccf61b10c8" xlink:to="loc_crwd_ChannelPartnerAMember_2f53f7a3-dc8c-4d4b-ad5d-491de08e73b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ChannelPartnerBMember_e169b3fa-aba3-4ea9-9fe7-f2d559da28f3" xlink:href="crwd-20201031.xsd#crwd_ChannelPartnerBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_9f1b5362-93a3-45bb-8aff-4dccf61b10c8" xlink:to="loc_crwd_ChannelPartnerBMember_e169b3fa-aba3-4ea9-9fe7-f2d559da28f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CustomerBMember_3171de37-ae2d-4672-96a4-9e4fffa23670" xlink:href="crwd-20201031.xsd#crwd_CustomerBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_9f1b5362-93a3-45bb-8aff-4dccf61b10c8" xlink:to="loc_crwd_CustomerBMember_3171de37-ae2d-4672-96a4-9e4fffa23670" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_fcbfb2bf-efec-48c3-9c74-056bc257396e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_48dda356-d85f-4830-a0ff-56daa768f405" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_fcbfb2bf-efec-48c3-9c74-056bc257396e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_fcbfb2bf-efec-48c3-9c74-056bc257396e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_fcbfb2bf-efec-48c3-9c74-056bc257396e" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_fcbfb2bf-efec-48c3-9c74-056bc257396e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_75ac5b64-7b93-4165-b12c-b8d40bd6aead" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_fcbfb2bf-efec-48c3-9c74-056bc257396e" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_75ac5b64-7b93-4165-b12c-b8d40bd6aead" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_f01a6c86-abdd-4fe7-8d3d-82d2ec860e99" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_75ac5b64-7b93-4165-b12c-b8d40bd6aead" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_f01a6c86-abdd-4fe7-8d3d-82d2ec860e99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_DistributorConcentrationRiskMember_b27ccf2f-7cae-4f4c-baea-9f105d03a09d" xlink:href="crwd-20201031.xsd#crwd_DistributorConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_75ac5b64-7b93-4165-b12c-b8d40bd6aead" xlink:to="loc_crwd_DistributorConcentrationRiskMember_b27ccf2f-7cae-4f4c-baea-9f105d03a09d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_acdd587c-b020-4e8d-ab49-eb56b6d8c0ab" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_48dda356-d85f-4830-a0ff-56daa768f405" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_acdd587c-b020-4e8d-ab49-eb56b6d8c0ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_acdd587c-b020-4e8d-ab49-eb56b6d8c0ab_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_acdd587c-b020-4e8d-ab49-eb56b6d8c0ab" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_acdd587c-b020-4e8d-ab49-eb56b6d8c0ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_c1c5c661-438e-403c-bd6a-b460684a8c9b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_acdd587c-b020-4e8d-ab49-eb56b6d8c0ab" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_c1c5c661-438e-403c-bd6a-b460684a8c9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableMember_8430584a-932a-47c5-97cf-5f685c8d1ef0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountsReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_c1c5c661-438e-403c-bd6a-b460684a8c9b" xlink:to="loc_us-gaap_AccountsReceivableMember_8430584a-932a-47c5-97cf-5f685c8d1ef0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesRevenueNetMember_55e0d5bf-06c2-4804-830e-ab2a07762839" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SalesRevenueNetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_c1c5c661-438e-403c-bd6a-b460684a8c9b" xlink:to="loc_us-gaap_SalesRevenueNetMember_55e0d5bf-06c2-4804-830e-ab2a07762839" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecurities" xlink:type="simple" xlink:href="crwd-20201031.xsd#FairValueMeasurementsandMarketableSecurities"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecurities" xlink:type="extended" id="i3925c3c507144b9788da9412b8c376a3_FairValueMeasurementsandMarketableSecurities"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesTables" xlink:type="simple" xlink:href="crwd-20201031.xsd#FairValueMeasurementsandMarketableSecuritiesTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesTables" xlink:type="extended" id="i9f35d961f04c4be3a820960324f6a964_FairValueMeasurementsandMarketableSecuritiesTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesFinancialAssetsandLiabilitiesDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#FairValueMeasurementsandMarketableSecuritiesFinancialAssetsandLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesFinancialAssetsandLiabilitiesDetails" xlink:type="extended" id="id994179430304ec59d34e2e342912f36_FairValueMeasurementsandMarketableSecuritiesFinancialAssetsandLiabilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ac03d9c3-3f62-43cc-8715-d7908e6c0a5e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_0d06689f-3072-48a9-bf17-6897f86afdbe" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ac03d9c3-3f62-43cc-8715-d7908e6c0a5e" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_0d06689f-3072-48a9-bf17-6897f86afdbe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_bb3f50ac-ee3b-4d83-8f3f-e999138b70cf" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_0d06689f-3072-48a9-bf17-6897f86afdbe" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_bb3f50ac-ee3b-4d83-8f3f-e999138b70cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_9c9a77bb-7b9d-4d49-93a2-50ca6c11555f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_0d06689f-3072-48a9-bf17-6897f86afdbe" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent_9c9a77bb-7b9d-4d49-93a2-50ca6c11555f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_0677a6eb-d614-4ce7-bde6-be3585bd0d2f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_0d06689f-3072-48a9-bf17-6897f86afdbe" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_0677a6eb-d614-4ce7-bde6-be3585bd0d2f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_85eb5ac9-9db3-4bdd-812f-8667cf3c1319" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ac03d9c3-3f62-43cc-8715-d7908e6c0a5e" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_85eb5ac9-9db3-4bdd-812f-8667cf3c1319" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c3251906-62eb-4dfd-97bc-1b17673e698b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_85eb5ac9-9db3-4bdd-812f-8667cf3c1319" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c3251906-62eb-4dfd-97bc-1b17673e698b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c3251906-62eb-4dfd-97bc-1b17673e698b_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c3251906-62eb-4dfd-97bc-1b17673e698b" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_c3251906-62eb-4dfd-97bc-1b17673e698b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8a3b3a04-a3bf-40dd-a662-1c0968639e00" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c3251906-62eb-4dfd-97bc-1b17673e698b" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8a3b3a04-a3bf-40dd-a662-1c0968639e00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_1f702760-20bb-4bc7-8109-cfbd353c4796" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8a3b3a04-a3bf-40dd-a662-1c0968639e00" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_1f702760-20bb-4bc7-8109-cfbd353c4796" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_c23d236a-0727-453a-ac58-0629bde163e4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8a3b3a04-a3bf-40dd-a662-1c0968639e00" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_c23d236a-0727-453a-ac58-0629bde163e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_e76641a7-dcb5-4bf1-b277-4728c3e19dae" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8a3b3a04-a3bf-40dd-a662-1c0968639e00" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_e76641a7-dcb5-4bf1-b277-4728c3e19dae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6072bbac-68d4-4a14-a5e6-1159ba91c1fc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_85eb5ac9-9db3-4bdd-812f-8667cf3c1319" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6072bbac-68d4-4a14-a5e6-1159ba91c1fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_6072bbac-68d4-4a14-a5e6-1159ba91c1fc_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6072bbac-68d4-4a14-a5e6-1159ba91c1fc" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_6072bbac-68d4-4a14-a5e6-1159ba91c1fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_384f48b1-e506-4aec-a090-6160c1c9a2ac" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_6072bbac-68d4-4a14-a5e6-1159ba91c1fc" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_384f48b1-e506-4aec-a090-6160c1c9a2ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_46a30329-6b5f-4d35-b1e3-c5ebfd9dd8dc" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_384f48b1-e506-4aec-a090-6160c1c9a2ac" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_46a30329-6b5f-4d35-b1e3-c5ebfd9dd8dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_353fb007-9f43-4b29-9044-540eac54e3cd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_85eb5ac9-9db3-4bdd-812f-8667cf3c1319" xlink:to="loc_us-gaap_FinancialInstrumentAxis_353fb007-9f43-4b29-9044-540eac54e3cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_353fb007-9f43-4b29-9044-540eac54e3cd_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_353fb007-9f43-4b29-9044-540eac54e3cd" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_353fb007-9f43-4b29-9044-540eac54e3cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_665b1d3f-8aea-4628-8b5e-311828921eae" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_353fb007-9f43-4b29-9044-540eac54e3cd" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_665b1d3f-8aea-4628-8b5e-311828921eae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_9af3f932-ab52-47e4-b060-0dbff52afc51" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_665b1d3f-8aea-4628-8b5e-311828921eae" xlink:to="loc_us-gaap_MoneyMarketFundsMember_9af3f932-ab52-47e4-b060-0dbff52afc51" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_d4f6ef05-2996-4fdd-873e-017074536350" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_665b1d3f-8aea-4628-8b5e-311828921eae" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_d4f6ef05-2996-4fdd-873e-017074536350" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_03c0ac7d-67f3-4b06-aed2-9aa24afc5ab1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_665b1d3f-8aea-4628-8b5e-311828921eae" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_03c0ac7d-67f3-4b06-aed2-9aa24afc5ab1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_9d95faaf-72af-4f1e-8fd1-830231a0975c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_665b1d3f-8aea-4628-8b5e-311828921eae" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_9d95faaf-72af-4f1e-8fd1-830231a0975c" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesAdditionalInformationDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#FairValueMeasurementsandMarketableSecuritiesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesAdditionalInformationDetails" xlink:type="extended" id="i40095f6042704f3fa60d4e8425c1ebb2_FairValueMeasurementsandMarketableSecuritiesAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_a3098b21-8ab6-410e-bba9-c1fd6a394be2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfInvestments_2872652a-f238-4d61-9acf-ea871bb90320" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ImpairmentOfInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_a3098b21-8ab6-410e-bba9-c1fd6a394be2" xlink:to="loc_us-gaap_ImpairmentOfInvestments_2872652a-f238-4d61-9acf-ea871bb90320" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_8058588d-8b68-44ec-95ec-a731dd994bb2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_a3098b21-8ab6-410e-bba9-c1fd6a394be2" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax_8058588d-8b68-44ec-95ec-a731dd994bb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_7e6c26f1-65eb-4c69-a2a5-bc98c32da42d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_a3098b21-8ab6-410e-bba9-c1fd6a394be2" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_7e6c26f1-65eb-4c69-a2a5-bc98c32da42d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ConversionOfWarrantsWarrantsIssued_6f38130f-6a0d-471a-bca0-0717cae7b13b" xlink:href="crwd-20201031.xsd#crwd_ConversionOfWarrantsWarrantsIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_a3098b21-8ab6-410e-bba9-c1fd6a394be2" xlink:to="loc_crwd_ConversionOfWarrantsWarrantsIssued_6f38130f-6a0d-471a-bca0-0717cae7b13b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockConversionWarrantsConversionRatio_8b38d353-7a6a-4576-9e45-dc9981201fc8" xlink:href="crwd-20201031.xsd#crwd_StockConversionWarrantsConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_a3098b21-8ab6-410e-bba9-c1fd6a394be2" xlink:to="loc_crwd_StockConversionWarrantsConversionRatio_8b38d353-7a6a-4576-9e45-dc9981201fc8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_68473625-f97d-4db9-a726-48bc68f33264" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_a3098b21-8ab6-410e-bba9-c1fd6a394be2" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_68473625-f97d-4db9-a726-48bc68f33264" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_30087336-cfc5-4fb5-8e3e-934609679723" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_68473625-f97d-4db9-a726-48bc68f33264" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_30087336-cfc5-4fb5-8e3e-934609679723" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_30087336-cfc5-4fb5-8e3e-934609679723_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_30087336-cfc5-4fb5-8e3e-934609679723" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_30087336-cfc5-4fb5-8e3e-934609679723_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_f443a169-68f1-443a-96c7-7d780bca0eb5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_30087336-cfc5-4fb5-8e3e-934609679723" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_f443a169-68f1-443a-96c7-7d780bca0eb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IPOMember_1d6c8d95-35d1-410d-800c-9eeae834c067" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IPOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_f443a169-68f1-443a-96c7-7d780bca0eb5" xlink:to="loc_us-gaap_IPOMember_1d6c8d95-35d1-410d-800c-9eeae834c067" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_dee2aa92-f9e2-4042-9fe9-c48ea4c2277e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_68473625-f97d-4db9-a726-48bc68f33264" xlink:to="loc_us-gaap_StatementClassOfStockAxis_dee2aa92-f9e2-4042-9fe9-c48ea4c2277e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_dee2aa92-f9e2-4042-9fe9-c48ea4c2277e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_dee2aa92-f9e2-4042-9fe9-c48ea4c2277e" xlink:to="loc_us-gaap_ClassOfStockDomain_dee2aa92-f9e2-4042-9fe9-c48ea4c2277e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_b96f2b4d-9f0e-409b-acac-af97b1112626" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_dee2aa92-f9e2-4042-9fe9-c48ea4c2277e" xlink:to="loc_us-gaap_ClassOfStockDomain_b96f2b4d-9f0e-409b-acac-af97b1112626" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_ba673a68-80a2-46af-b444-7b5125570fb4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_b96f2b4d-9f0e-409b-acac-af97b1112626" xlink:to="loc_us-gaap_CommonClassBMember_ba673a68-80a2-46af-b444-7b5125570fb4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasuresandMarketableSecuritiesMaturitiesDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#FairValueMeasuresandMarketableSecuritiesMaturitiesDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasuresandMarketableSecuritiesMaturitiesDetails" xlink:type="extended" id="i0f26b24a6e5f41c8bd2f06b465c4a1e3_FairValueMeasuresandMarketableSecuritiesMaturitiesDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasuresandMarketableSecuritiesStrategicInvestmentsDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#FairValueMeasuresandMarketableSecuritiesStrategicInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasuresandMarketableSecuritiesStrategicInvestmentsDetails" xlink:type="extended" id="i358fc875877a4ae8aedd24a5fd9c3e60_FairValueMeasuresandMarketableSecuritiesStrategicInvestmentsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_45b60b17-759d-4c17-b237-c43e853fb56c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentAggregateCost_c02ffa63-8793-4414-9985-7227b61e8ea4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityMethodInvestmentAggregateCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_45b60b17-759d-4c17-b237-c43e853fb56c" xlink:to="loc_us-gaap_EquityMethodInvestmentAggregateCost_c02ffa63-8793-4414-9985-7227b61e8ea4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss_dfe04d4f-e9f6-4e51-aeec-652bb4cdbbe6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_45b60b17-759d-4c17-b237-c43e853fb56c" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesUnrealizedGainLoss_dfe04d4f-e9f6-4e51-aeec-652bb4cdbbe6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_52bf2309-3c1e-4a09-8375-15316cfc5fd6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_45b60b17-759d-4c17-b237-c43e853fb56c" xlink:to="loc_us-gaap_EquityMethodInvestments_52bf2309-3c1e-4a09-8375-15316cfc5fd6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_9ca0f4bf-044c-4c58-a590-62f80b6270f0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_45b60b17-759d-4c17-b237-c43e853fb56c" xlink:to="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_9ca0f4bf-044c-4c58-a590-62f80b6270f0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_8e5ede2e-4654-4a92-8a3b-7a3599905fa2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_9ca0f4bf-044c-4c58-a590-62f80b6270f0" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_8e5ede2e-4654-4a92-8a3b-7a3599905fa2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_8e5ede2e-4654-4a92-8a3b-7a3599905fa2_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_8e5ede2e-4654-4a92-8a3b-7a3599905fa2" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_8e5ede2e-4654-4a92-8a3b-7a3599905fa2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_a4314252-2151-4eae-a057-a437a779a63e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_8e5ede2e-4654-4a92-8a3b-7a3599905fa2" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_a4314252-2151-4eae-a057-a437a779a63e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsMember_f3982110-b2ce-44f2-b233-24ddd1fb4280" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_a4314252-2151-4eae-a057-a437a779a63e" xlink:to="loc_us-gaap_EquityMethodInvestmentsMember_f3982110-b2ce-44f2-b233-24ddd1fb4280" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesRedeemableconvertiblepreferredstockwarrantliabilityDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#FairValueMeasurementsandMarketableSecuritiesRedeemableconvertiblepreferredstockwarrantliabilityDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/FairValueMeasurementsandMarketableSecuritiesRedeemableconvertiblepreferredstockwarrantliabilityDetails" xlink:type="extended" id="i4879a16fa23a4144adf8acbdba9df8c3_FairValueMeasurementsandMarketableSecuritiesRedeemableconvertiblepreferredstockwarrantliabilityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_04d7cad6-3897-40d9-9eee-96ac12068dae" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_19a00d88-26b8-4e6c-a049-9aef8d0fa8f1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_04d7cad6-3897-40d9-9eee-96ac12068dae" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_19a00d88-26b8-4e6c-a049-9aef8d0fa8f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_eedf5d80-2c61-4415-a04f-728806a7df4d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_19a00d88-26b8-4e6c-a049-9aef8d0fa8f1" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_eedf5d80-2c61-4415-a04f-728806a7df4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_0751971a-bea8-4e1e-b475-eefb9ce6ab70" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_19a00d88-26b8-4e6c-a049-9aef8d0fa8f1" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_0751971a-bea8-4e1e-b475-eefb9ce6ab70" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_bbf1a6d1-78fe-41e1-809b-79d444b6f751" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_19a00d88-26b8-4e6c-a049-9aef8d0fa8f1" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3_bbf1a6d1-78fe-41e1-809b-79d444b6f751" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_91127458-5210-4760-8b3c-c40c5869ed2f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_507dd7c0-b8b7-45a0-9b42-4e8e2362f5f3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_04d7cad6-3897-40d9-9eee-96ac12068dae" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_507dd7c0-b8b7-45a0-9b42-4e8e2362f5f3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a75a7e-f27f-4282-b74c-f23123706854" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_507dd7c0-b8b7-45a0-9b42-4e8e2362f5f3" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a75a7e-f27f-4282-b74c-f23123706854" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a75a7e-f27f-4282-b74c-f23123706854_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a75a7e-f27f-4282-b74c-f23123706854" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a75a7e-f27f-4282-b74c-f23123706854_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_58ba381d-4593-4d33-9ade-dfe08879d33a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a75a7e-f27f-4282-b74c-f23123706854" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_58ba381d-4593-4d33-9ade-dfe08879d33a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_8a965146-280c-4262-9e59-fc92b5b050db" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_58ba381d-4593-4d33-9ade-dfe08879d33a" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_8a965146-280c-4262-9e59-fc92b5b050db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_35d6d65a-57ad-4103-90d7-98ad9225b961" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_507dd7c0-b8b7-45a0-9b42-4e8e2362f5f3" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_35d6d65a-57ad-4103-90d7-98ad9225b961" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_35d6d65a-57ad-4103-90d7-98ad9225b961_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_35d6d65a-57ad-4103-90d7-98ad9225b961" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_35d6d65a-57ad-4103-90d7-98ad9225b961_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_8ba2a413-f841-46f2-bfd6-432467f1caad" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_35d6d65a-57ad-4103-90d7-98ad9225b961" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_8ba2a413-f841-46f2-bfd6-432467f1caad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_RedeemableConvertiblePreferredStockWarrantsMember_83b77bdd-3759-48b4-969c-b290aa860f36" xlink:href="crwd-20201031.xsd#crwd_RedeemableConvertiblePreferredStockWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_8ba2a413-f841-46f2-bfd6-432467f1caad" xlink:to="loc_crwd_RedeemableConvertiblePreferredStockWarrantsMember_83b77bdd-3759-48b4-969c-b290aa860f36" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponents" xlink:type="simple" xlink:href="crwd-20201031.xsd#BalanceSheetComponents"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponents" xlink:type="extended" id="i503829c28bc0408a9e53399c8866cf55_BalanceSheetComponents"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsTables" xlink:type="simple" xlink:href="crwd-20201031.xsd#BalanceSheetComponentsTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsTables" xlink:type="extended" id="ifb7d86c8ba824ecc9d75136eae8b18ea_BalanceSheetComponentsTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsPrepaidExpensesandOtherCurrentAssetsDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#BalanceSheetComponentsPrepaidExpensesandOtherCurrentAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsPrepaidExpensesandOtherCurrentAssetsDetails" xlink:type="extended" id="i229512c07b324d9ab556db9e37995480_BalanceSheetComponentsPrepaidExpensesandOtherCurrentAssetsDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsPropertyandEquipmentNetDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#BalanceSheetComponentsPropertyandEquipmentNetDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsPropertyandEquipmentNetDetails" xlink:type="extended" id="ia0a906237bd04148a9a3aa3146bf74b2_BalanceSheetComponentsPropertyandEquipmentNetDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_aadc0c3a-c6ba-499e-9c93-ebc028b95041" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_c434bddf-90fa-42bc-8f71-e28311cbcd71" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_aadc0c3a-c6ba-499e-9c93-ebc028b95041" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_c434bddf-90fa-42bc-8f71-e28311cbcd71" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_a7a6f0f6-4b4f-4b0b-b1ad-27871d31f717" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_aadc0c3a-c6ba-499e-9c93-ebc028b95041" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_a7a6f0f6-4b4f-4b0b-b1ad-27871d31f717" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_b5e3b10a-0400-4992-baba-c46efb25d216" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_aadc0c3a-c6ba-499e-9c93-ebc028b95041" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_b5e3b10a-0400-4992-baba-c46efb25d216" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_568898e8-0c8d-4efd-a339-addaa3851672" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_aadc0c3a-c6ba-499e-9c93-ebc028b95041" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_568898e8-0c8d-4efd-a339-addaa3851672" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_bc2e6ce5-3ffa-4cf6-9f54-a7a868dc4f88" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_568898e8-0c8d-4efd-a339-addaa3851672" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_bc2e6ce5-3ffa-4cf6-9f54-a7a868dc4f88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_bc2e6ce5-3ffa-4cf6-9f54-a7a868dc4f88_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_bc2e6ce5-3ffa-4cf6-9f54-a7a868dc4f88" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_bc2e6ce5-3ffa-4cf6-9f54-a7a868dc4f88_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_075f66ab-2616-4960-8723-5cab8af81e6c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_bc2e6ce5-3ffa-4cf6-9f54-a7a868dc4f88" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_075f66ab-2616-4960-8723-5cab8af81e6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_DataCenterAndOtherComputerEquipmentMember_974c9392-6813-47f6-8d0d-dcf02fd8b918" xlink:href="crwd-20201031.xsd#crwd_DataCenterAndOtherComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_075f66ab-2616-4960-8723-5cab8af81e6c" xlink:to="loc_crwd_DataCenterAndOtherComputerEquipmentMember_974c9392-6813-47f6-8d0d-dcf02fd8b918" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SoftwareDevelopmentMember_71a4b14d-4a5d-49d4-82e1-fb4b6bab06e1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SoftwareDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_075f66ab-2616-4960-8723-5cab8af81e6c" xlink:to="loc_us-gaap_SoftwareDevelopmentMember_71a4b14d-4a5d-49d4-82e1-fb4b6bab06e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_d6d4740b-18c3-4d5b-8b81-20f58102d98b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_075f66ab-2616-4960-8723-5cab8af81e6c" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_d6d4740b-18c3-4d5b-8b81-20f58102d98b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PurchasedSoftwareMember_17f2a061-25e2-432a-b5cd-a2dfb31d00e9" xlink:href="crwd-20201031.xsd#crwd_PurchasedSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_075f66ab-2616-4960-8723-5cab8af81e6c" xlink:to="loc_crwd_PurchasedSoftwareMember_17f2a061-25e2-432a-b5cd-a2dfb31d00e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_FurnitureAndEquipmentMember_1b099f9b-8743-41e4-a6f3-46d46d2a039f" xlink:href="crwd-20201031.xsd#crwd_FurnitureAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_075f66ab-2616-4960-8723-5cab8af81e6c" xlink:to="loc_crwd_FurnitureAndEquipmentMember_1b099f9b-8743-41e4-a6f3-46d46d2a039f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_1eb6a9e9-3773-4b1b-beda-d3ae5450b843" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_075f66ab-2616-4960-8723-5cab8af81e6c" xlink:to="loc_us-gaap_ConstructionInProgressMember_1eb6a9e9-3773-4b1b-beda-d3ae5450b843" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsAdditionalInformationDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#BalanceSheetComponentsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsAdditionalInformationDetails" xlink:type="extended" id="idd4c5ba9cfea420da92b1827d51917e0_BalanceSheetComponentsAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0f3988c5-84cf-4b39-9eee-6a477ba1ba27" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EquipmentPurchasedButNotYetPlacedIntoService_d8c3bed4-0f01-4621-a6e2-20eb6489c986" xlink:href="crwd-20201031.xsd#crwd_EquipmentPurchasedButNotYetPlacedIntoService"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0f3988c5-84cf-4b39-9eee-6a477ba1ba27" xlink:to="loc_crwd_EquipmentPurchasedButNotYetPlacedIntoService_d8c3bed4-0f01-4621-a6e2-20eb6489c986" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_DepreciationAndAmortizationExcludingIntangibleAssetsAndDeferredContractAcquisitionCosts_1343180f-96d4-4dfd-9cf3-88a473f8f622" xlink:href="crwd-20201031.xsd#crwd_DepreciationAndAmortizationExcludingIntangibleAssetsAndDeferredContractAcquisitionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0f3988c5-84cf-4b39-9eee-6a477ba1ba27" xlink:to="loc_crwd_DepreciationAndAmortizationExcludingIntangibleAssetsAndDeferredContractAcquisitionCosts_1343180f-96d4-4dfd-9cf3-88a473f8f622" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareImpairments1_feb1ec32-7e1a-48b4-beed-2cc02338ba4f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedComputerSoftwareImpairments1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0f3988c5-84cf-4b39-9eee-6a477ba1ba27" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareImpairments1_feb1ec32-7e1a-48b4-beed-2cc02338ba4f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAdditions_4ad2367c-5584-4235-994c-628a8c669ab0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedComputerSoftwareAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0f3988c5-84cf-4b39-9eee-6a477ba1ba27" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAdditions_4ad2367c-5584-4235-994c-628a8c669ab0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_cb749f77-ab4c-4a33-a2cb-c60f31b9d85e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedComputerSoftwareAmortization1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0f3988c5-84cf-4b39-9eee-6a477ba1ba27" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareAmortization1_cb749f77-ab4c-4a33-a2cb-c60f31b9d85e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedComputerSoftwareNet_e97906ec-eb49-463a-8874-21a1bd2c8202" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedComputerSoftwareNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0f3988c5-84cf-4b39-9eee-6a477ba1ba27" xlink:to="loc_us-gaap_CapitalizedComputerSoftwareNet_e97906ec-eb49-463a-8874-21a1bd2c8202" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_3d78025f-abb2-4ecb-9c3a-2c5dca80525e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0f3988c5-84cf-4b39-9eee-6a477ba1ba27" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_3d78025f-abb2-4ecb-9c3a-2c5dca80525e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_ae805470-51b3-4f87-8df4-ecc348720aec" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0f3988c5-84cf-4b39-9eee-6a477ba1ba27" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_ae805470-51b3-4f87-8df4-ecc348720aec" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_SocialSecurityTaxEmployerDeferralCARESAct_1cce478f-9eae-47a0-8961-f5bf786a89a1" xlink:href="crwd-20201031.xsd#crwd_SocialSecurityTaxEmployerDeferralCARESAct"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0f3988c5-84cf-4b39-9eee-6a477ba1ba27" xlink:to="loc_crwd_SocialSecurityTaxEmployerDeferralCARESAct_1cce478f-9eae-47a0-8961-f5bf786a89a1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_0fe89163-c7b3-4f45-987e-f1a6f85427ca" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_0f3988c5-84cf-4b39-9eee-6a477ba1ba27" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_0fe89163-c7b3-4f45-987e-f1a6f85427ca" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_97458a35-4ceb-4c45-b174-e79fa8be31a3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_0fe89163-c7b3-4f45-987e-f1a6f85427ca" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_97458a35-4ceb-4c45-b174-e79fa8be31a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_97458a35-4ceb-4c45-b174-e79fa8be31a3_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_97458a35-4ceb-4c45-b174-e79fa8be31a3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_97458a35-4ceb-4c45-b174-e79fa8be31a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6d83ae57-acc3-48c7-9524-70475eb88c9d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_97458a35-4ceb-4c45-b174-e79fa8be31a3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6d83ae57-acc3-48c7-9524-70475eb88c9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_87938ecd-d70e-408f-ba45-18d92042917d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6d83ae57-acc3-48c7-9524-70475eb88c9d" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_87938ecd-d70e-408f-ba45-18d92042917d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_9288cc51-c53f-4e58-8500-e68828e91e2f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6d83ae57-acc3-48c7-9524-70475eb88c9d" xlink:to="loc_us-gaap_CustomerRelationshipsMember_9288cc51-c53f-4e58-8500-e68828e91e2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_3e6f35c7-b8aa-44b7-af68-75620798a414" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NoncompeteAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6d83ae57-acc3-48c7-9524-70475eb88c9d" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_3e6f35c7-b8aa-44b7-af68-75620798a414" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_a29888fb-892f-4413-b6ad-cf82eddc3c8b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_0fe89163-c7b3-4f45-987e-f1a6f85427ca" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_a29888fb-892f-4413-b6ad-cf82eddc3c8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a29888fb-892f-4413-b6ad-cf82eddc3c8b_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_a29888fb-892f-4413-b6ad-cf82eddc3c8b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a29888fb-892f-4413-b6ad-cf82eddc3c8b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c75ac9e7-3193-4c0d-8bbb-f44222558d26" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_a29888fb-892f-4413-b6ad-cf82eddc3c8b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c75ac9e7-3193-4c0d-8bbb-f44222558d26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_DataCenterAndOtherComputerEquipmentMember_5dcc6509-35de-4f59-8780-98d17b4b4557" xlink:href="crwd-20201031.xsd#crwd_DataCenterAndOtherComputerEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_c75ac9e7-3193-4c0d-8bbb-f44222558d26" xlink:to="loc_crwd_DataCenterAndOtherComputerEquipmentMember_5dcc6509-35de-4f59-8780-98d17b4b4557" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsIntangibleAssetsNetDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#BalanceSheetComponentsIntangibleAssetsNetDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsIntangibleAssetsNetDetails" xlink:type="extended" id="i436b3091430040c78544c1512722d06f_BalanceSheetComponentsIntangibleAssetsNetDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_da4a5393-df6e-41cf-a889-c070f35e3b02" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_1a53240e-4bb5-42ec-b96f-d1cfe55dffec" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_da4a5393-df6e-41cf-a889-c070f35e3b02" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_1a53240e-4bb5-42ec-b96f-d1cfe55dffec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_b034a05c-26fa-45a3-a9c6-5216a654a413" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_da4a5393-df6e-41cf-a889-c070f35e3b02" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_b034a05c-26fa-45a3-a9c6-5216a654a413" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_2bc06d59-98f8-474c-be8d-3ab96d270540" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_da4a5393-df6e-41cf-a889-c070f35e3b02" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_2bc06d59-98f8-474c-be8d-3ab96d270540" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_5457230b-5798-4ac6-8652-b252f2fcfa94" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_da4a5393-df6e-41cf-a889-c070f35e3b02" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_5457230b-5798-4ac6-8652-b252f2fcfa94" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_233301d6-4e2a-49ee-8f78-fe56ab6f09d7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_da4a5393-df6e-41cf-a889-c070f35e3b02" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_233301d6-4e2a-49ee-8f78-fe56ab6f09d7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_da73e57a-37bb-4237-9b35-d36bc15dbc8e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_233301d6-4e2a-49ee-8f78-fe56ab6f09d7" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_da73e57a-37bb-4237-9b35-d36bc15dbc8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_da73e57a-37bb-4237-9b35-d36bc15dbc8e_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_da73e57a-37bb-4237-9b35-d36bc15dbc8e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_da73e57a-37bb-4237-9b35-d36bc15dbc8e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_15499f36-d39d-4b39-96e4-21e12aa7cf35" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_da73e57a-37bb-4237-9b35-d36bc15dbc8e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_15499f36-d39d-4b39-96e4-21e12aa7cf35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_da471ca4-a056-46f1-ac42-22dbee979591" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_15499f36-d39d-4b39-96e4-21e12aa7cf35" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_da471ca4-a056-46f1-ac42-22dbee979591" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_b096ce61-257c-4b95-be33-aa3c466929cb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_15499f36-d39d-4b39-96e4-21e12aa7cf35" xlink:to="loc_us-gaap_CustomerRelationshipsMember_b096ce61-257c-4b95-be33-aa3c466929cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_c3dd0cdd-89e9-48d7-ac42-a6548546556c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_15499f36-d39d-4b39-96e4-21e12aa7cf35" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_c3dd0cdd-89e9-48d7-ac42-a6548546556c" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsFutureAmortizationExpenseDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#BalanceSheetComponentsFutureAmortizationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsFutureAmortizationExpenseDetails" xlink:type="extended" id="i0677765cdb6d4191957aace56661f7c0_BalanceSheetComponentsFutureAmortizationExpenseDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsGoodwillRollforwardDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#BalanceSheetComponentsGoodwillRollforwardDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsGoodwillRollforwardDetails" xlink:type="extended" id="iae0d2de2bb274e2fb36eec15e6a7b031_BalanceSheetComponentsGoodwillRollforwardDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/BalanceSheetComponentsAccruedExpensesDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#BalanceSheetComponentsAccruedExpensesDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/BalanceSheetComponentsAccruedExpensesDetails" xlink:type="extended" id="ied993e7cb10c47299329236047365a12_BalanceSheetComponentsAccruedExpensesDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SecuredRevolvingCreditFacility" xlink:type="simple" xlink:href="crwd-20201031.xsd#SecuredRevolvingCreditFacility"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SecuredRevolvingCreditFacility" xlink:type="extended" id="i51a8412b220c4a2faa4305af51dfccb5_SecuredRevolvingCreditFacility"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/SecuredRevolvingCreditFacilityDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#SecuredRevolvingCreditFacilityDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/SecuredRevolvingCreditFacilityDetails" xlink:type="extended" id="i412ae43ad6af4e828800b1434ba2b16e_SecuredRevolvingCreditFacilityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_50937080-5dfe-48ca-9e1a-05a6e8b47381" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_62c1c4c6-e0f5-4659-aa16-25aa4859a07e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_50937080-5dfe-48ca-9e1a-05a6e8b47381" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_62c1c4c6-e0f5-4659-aa16-25aa4859a07e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_LineOfCreditFacilityIncrementalBorrowingCapacity_0922873e-a5b1-41ca-ad95-78257cff4e9b" xlink:href="crwd-20201031.xsd#crwd_LineOfCreditFacilityIncrementalBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_50937080-5dfe-48ca-9e1a-05a6e8b47381" xlink:to="loc_crwd_LineOfCreditFacilityIncrementalBorrowingCapacity_0922873e-a5b1-41ca-ad95-78257cff4e9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_LineOfCreditFacilityBorrowingCapacityMultipleFactorForFirstFiscalYear_aba5e0f0-da32-4b6c-ac41-f5e454ef4fd6" xlink:href="crwd-20201031.xsd#crwd_LineOfCreditFacilityBorrowingCapacityMultipleFactorForFirstFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_50937080-5dfe-48ca-9e1a-05a6e8b47381" xlink:to="loc_crwd_LineOfCreditFacilityBorrowingCapacityMultipleFactorForFirstFiscalYear_aba5e0f0-da32-4b6c-ac41-f5e454ef4fd6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_LineOfCreditFacilityBorrowingCapacityMultipleFactorForSecondFiscalYear_5dfbcc96-2696-4b95-88e3-a3d2a65661fd" xlink:href="crwd-20201031.xsd#crwd_LineOfCreditFacilityBorrowingCapacityMultipleFactorForSecondFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_50937080-5dfe-48ca-9e1a-05a6e8b47381" xlink:to="loc_crwd_LineOfCreditFacilityBorrowingCapacityMultipleFactorForSecondFiscalYear_5dfbcc96-2696-4b95-88e3-a3d2a65661fd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_LineofCreditFacilityBorrowingCapacityMultipleFactorAfterSecondFiscalYear_ad2da14a-e6f0-40ae-afdc-685fd8225a70" xlink:href="crwd-20201031.xsd#crwd_LineofCreditFacilityBorrowingCapacityMultipleFactorAfterSecondFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_50937080-5dfe-48ca-9e1a-05a6e8b47381" xlink:to="loc_crwd_LineofCreditFacilityBorrowingCapacityMultipleFactorAfterSecondFiscalYear_ad2da14a-e6f0-40ae-afdc-685fd8225a70" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_9117cc38-f831-4e6b-b7f0-849ff85a2a9b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_50937080-5dfe-48ca-9e1a-05a6e8b47381" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_9117cc38-f831-4e6b-b7f0-849ff85a2a9b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_77274d47-5327-48f8-9460-84d9c3c80ee7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_50937080-5dfe-48ca-9e1a-05a6e8b47381" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_77274d47-5327-48f8-9460-84d9c3c80ee7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_741107b9-29b4-46a0-bdda-07001a2bdde2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_50937080-5dfe-48ca-9e1a-05a6e8b47381" xlink:to="loc_us-gaap_LineOfCredit_741107b9-29b4-46a0-bdda-07001a2bdde2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_73047019-f7b2-4f16-956d-050375e79c04" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_50937080-5dfe-48ca-9e1a-05a6e8b47381" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_73047019-f7b2-4f16-956d-050375e79c04" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_6b345783-4e43-4057-8942-aecd206f9099" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_73047019-f7b2-4f16-956d-050375e79c04" xlink:to="loc_us-gaap_CreditFacilityAxis_6b345783-4e43-4057-8942-aecd206f9099" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_6b345783-4e43-4057-8942-aecd206f9099_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_6b345783-4e43-4057-8942-aecd206f9099" xlink:to="loc_us-gaap_CreditFacilityDomain_6b345783-4e43-4057-8942-aecd206f9099_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_874aa7bf-9f95-49f2-a0f9-2ab76b55def0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_6b345783-4e43-4057-8942-aecd206f9099" xlink:to="loc_us-gaap_CreditFacilityDomain_874aa7bf-9f95-49f2-a0f9-2ab76b55def0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_625061d1-7b39-4ef3-af9d-618c127d4a8b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_874aa7bf-9f95-49f2-a0f9-2ab76b55def0" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_625061d1-7b39-4ef3-af9d-618c127d4a8b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_9e6b4a30-4db3-4215-bc00-68901bc31a44" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_625061d1-7b39-4ef3-af9d-618c127d4a8b" xlink:to="loc_us-gaap_LetterOfCreditMember_9e6b4a30-4db3-4215-bc00-68901bc31a44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_SwinglineFacilityMember_ed664908-46f9-441b-98a1-c52cf282f6c7" xlink:href="crwd-20201031.xsd#crwd_SwinglineFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_625061d1-7b39-4ef3-af9d-618c127d4a8b" xlink:to="loc_crwd_SwinglineFacilityMember_ed664908-46f9-441b-98a1-c52cf282f6c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EurodollarLoansMember_6a7e8e49-d203-4978-8a9a-4896c7f51349" xlink:href="crwd-20201031.xsd#crwd_EurodollarLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_625061d1-7b39-4ef3-af9d-618c127d4a8b" xlink:to="loc_crwd_EurodollarLoansMember_6a7e8e49-d203-4978-8a9a-4896c7f51349" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_AlternateBaseRateLoansMember_c1cab058-111f-4859-8e7e-fe8ae0e6cee0" xlink:href="crwd-20201031.xsd#crwd_AlternateBaseRateLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevolvingCreditFacilityMember_625061d1-7b39-4ef3-af9d-618c127d4a8b" xlink:to="loc_crwd_AlternateBaseRateLoansMember_c1cab058-111f-4859-8e7e-fe8ae0e6cee0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_663ae3ce-2619-40fd-b55c-e6a40ce3e77a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_73047019-f7b2-4f16-956d-050375e79c04" xlink:to="loc_us-gaap_VariableRateAxis_663ae3ce-2619-40fd-b55c-e6a40ce3e77a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_663ae3ce-2619-40fd-b55c-e6a40ce3e77a_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_663ae3ce-2619-40fd-b55c-e6a40ce3e77a" xlink:to="loc_us-gaap_VariableRateDomain_663ae3ce-2619-40fd-b55c-e6a40ce3e77a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_eb031561-5f26-42f0-aed8-5e968060981d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_663ae3ce-2619-40fd-b55c-e6a40ce3e77a" xlink:to="loc_us-gaap_VariableRateDomain_eb031561-5f26-42f0-aed8-5e968060981d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_238e8dc3-6ebd-4f36-872a-7acbefd636f0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_eb031561-5f26-42f0-aed8-5e968060981d" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_238e8dc3-6ebd-4f36-872a-7acbefd636f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalFundsEffectiveSwapRateMember_0adb7fd3-225f-429a-9f67-6f9076527f4b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FederalFundsEffectiveSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_eb031561-5f26-42f0-aed8-5e968060981d" xlink:to="loc_us-gaap_FederalFundsEffectiveSwapRateMember_0adb7fd3-225f-429a-9f67-6f9076527f4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EurodollarMember_c0e8ebd0-7c81-45c3-91f3-b8aa1943cb23" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EurodollarMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_eb031561-5f26-42f0-aed8-5e968060981d" xlink:to="loc_us-gaap_EurodollarMember_c0e8ebd0-7c81-45c3-91f3-b8aa1943cb23" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_b28a48aa-a49a-459a-9091-8ed19f37bf1a" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_73047019-f7b2-4f16-956d-050375e79c04" xlink:to="loc_srt_RangeAxis_b28a48aa-a49a-459a-9091-8ed19f37bf1a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b28a48aa-a49a-459a-9091-8ed19f37bf1a_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_b28a48aa-a49a-459a-9091-8ed19f37bf1a" xlink:to="loc_srt_RangeMember_b28a48aa-a49a-459a-9091-8ed19f37bf1a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_39682f87-7be9-42fe-bd9d-71ab8927a758" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_b28a48aa-a49a-459a-9091-8ed19f37bf1a" xlink:to="loc_srt_RangeMember_39682f87-7be9-42fe-bd9d-71ab8927a758" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_b9e7edde-2a83-4464-acd8-219ef63cae59" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_39682f87-7be9-42fe-bd9d-71ab8927a758" xlink:to="loc_srt_MinimumMember_b9e7edde-2a83-4464-acd8-219ef63cae59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_908f7add-106a-4cc5-bd7b-153e81b8ad7e" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_39682f87-7be9-42fe-bd9d-71ab8927a758" xlink:to="loc_srt_MaximumMember_908f7add-106a-4cc5-bd7b-153e81b8ad7e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/IncomeTaxes" xlink:type="simple" xlink:href="crwd-20201031.xsd#IncomeTaxes"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/IncomeTaxes" xlink:type="extended" id="i634c322eea3345b6ac6357b6ff948e75_IncomeTaxes"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/IncomeTaxesDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#IncomeTaxesDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/IncomeTaxesDetails" xlink:type="extended" id="i1d75f1ee9f12415e94a842b2414ea1d1_IncomeTaxesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyLineItems_6ae0f528-c2dc-4684-bcb1-2c9be29f8415" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxContingencyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_4b2df1c8-9a0d-499e-89a2-9e0852096885" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_6ae0f528-c2dc-4684-bcb1-2c9be29f8415" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_4b2df1c8-9a0d-499e-89a2-9e0852096885" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_3da22b7a-9f73-4186-b63b-68939c07c2d8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_6ae0f528-c2dc-4684-bcb1-2c9be29f8415" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_3da22b7a-9f73-4186-b63b-68939c07c2d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxContingencyTable_a53d4aaa-8c87-4c43-9b7b-88db49bc6255" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeTaxContingencyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeTaxContingencyLineItems_6ae0f528-c2dc-4684-bcb1-2c9be29f8415" xlink:to="loc_us-gaap_IncomeTaxContingencyTable_a53d4aaa-8c87-4c43-9b7b-88db49bc6255" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_eb7dff43-01ca-4799-a0d0-c3173c4bb539" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeTaxContingencyTable_a53d4aaa-8c87-4c43-9b7b-88db49bc6255" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_eb7dff43-01ca-4799-a0d0-c3173c4bb539" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_eb7dff43-01ca-4799-a0d0-c3173c4bb539_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_eb7dff43-01ca-4799-a0d0-c3173c4bb539" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_eb7dff43-01ca-4799-a0d0-c3173c4bb539_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3d53af54-f5a2-42f0-b941-1dec884f9439" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_eb7dff43-01ca-4799-a0d0-c3173c4bb539" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3d53af54-f5a2-42f0-b941-1dec884f9439" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PreemptSecurityIncMember_3ec227a7-6bb3-4a7d-8c97-fbbfa461b9ae" xlink:href="crwd-20201031.xsd#crwd_PreemptSecurityIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_3d53af54-f5a2-42f0-b941-1dec884f9439" xlink:to="loc_crwd_PreemptSecurityIncMember_3ec227a7-6bb3-4a7d-8c97-fbbfa461b9ae" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/Leases" xlink:type="simple" xlink:href="crwd-20201031.xsd#Leases"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/Leases" xlink:type="extended" id="i6730ed1caa94409f88a9654062a82da3_Leases"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/LeasesTables" xlink:type="simple" xlink:href="crwd-20201031.xsd#LeasesTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/LeasesTables" xlink:type="extended" id="i65efd72b427046f3893079e79e82859b_LeasesTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/LeasesAdditionalInformationDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#LeasesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/LeasesAdditionalInformationDetails" xlink:type="extended" id="ieec6086908e34fb59802755352b96105_LeasesAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasedAssetsLineItems_0e8b802c-0eab-4a57-9035-b24f4b962fab" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_cc81d5e2-3ced-4b0e-ac61-0663d2854a22" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_0e8b802c-0eab-4a57-9035-b24f4b962fab" xlink:to="loc_us-gaap_OperatingLeaseCost_cc81d5e2-3ced-4b0e-ac61-0663d2854a22" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubleaseIncome_7b0b1ddb-f8ac-416c-bfc3-d985469f7ce0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubleaseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_0e8b802c-0eab-4a57-9035-b24f4b962fab" xlink:to="loc_us-gaap_SubleaseIncome_7b0b1ddb-f8ac-416c-bfc3-d985469f7ce0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseAndRentalExpense_a995f0a0-9497-4e50-b61f-10f26fe5af0c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LeaseAndRentalExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_0e8b802c-0eab-4a57-9035-b24f4b962fab" xlink:to="loc_us-gaap_LeaseAndRentalExpense_a995f0a0-9497-4e50-b61f-10f26fe5af0c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments_4465a137-f3e1-4134-9b20-846163067d16" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeasePayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_0e8b802c-0eab-4a57-9035-b24f4b962fab" xlink:to="loc_us-gaap_OperatingLeasePayments_4465a137-f3e1-4134-9b20-846163067d16" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_OperatingLeaseLiabilitiesArisingFromObtainingOperatingRightOfUseAssets_8a217f9c-ff2a-4243-8dfb-a4251e424577" xlink:href="crwd-20201031.xsd#crwd_OperatingLeaseLiabilitiesArisingFromObtainingOperatingRightOfUseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_0e8b802c-0eab-4a57-9035-b24f4b962fab" xlink:to="loc_crwd_OperatingLeaseLiabilitiesArisingFromObtainingOperatingRightOfUseAssets_8a217f9c-ff2a-4243-8dfb-a4251e424577" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_d5845341-e047-4f28-8955-dfa17bfa98a4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_0e8b802c-0eab-4a57-9035-b24f4b962fab" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_d5845341-e047-4f28-8955-dfa17bfa98a4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_8fdcd40a-9ee9-4757-9d56-9b78b871d34b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_0e8b802c-0eab-4a57-9035-b24f4b962fab" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_8fdcd40a-9ee9-4757-9d56-9b78b871d34b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_be897b21-26a6-483c-ae00-b3a6feba6ed6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfOperatingLeasedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLeasedAssetsLineItems_0e8b802c-0eab-4a57-9035-b24f4b962fab" xlink:to="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_be897b21-26a6-483c-ae00-b3a6feba6ed6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d920b02e-45ce-4879-a093-788cf71140a1" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfOperatingLeasedAssetsTable_be897b21-26a6-483c-ae00-b3a6feba6ed6" xlink:to="loc_srt_RangeAxis_d920b02e-45ce-4879-a093-788cf71140a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d920b02e-45ce-4879-a093-788cf71140a1_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d920b02e-45ce-4879-a093-788cf71140a1" xlink:to="loc_srt_RangeMember_d920b02e-45ce-4879-a093-788cf71140a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_054e7edc-8218-432b-b0fe-e80619b810ca" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d920b02e-45ce-4879-a093-788cf71140a1" xlink:to="loc_srt_RangeMember_054e7edc-8218-432b-b0fe-e80619b810ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_d7b01f63-e943-4785-9864-bb91feef8e8a" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_054e7edc-8218-432b-b0fe-e80619b810ca" xlink:to="loc_srt_MinimumMember_d7b01f63-e943-4785-9864-bb91feef8e8a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e880078c-1530-477b-a806-1d0b9b830a8b" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_054e7edc-8218-432b-b0fe-e80619b810ca" xlink:to="loc_srt_MaximumMember_e880078c-1530-477b-a806-1d0b9b830a8b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/LeasesLeaseCostDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#LeasesLeaseCostDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/LeasesLeaseCostDetails" xlink:type="extended" id="i47513359a8304392b6cecffd2dc9accd_LeasesLeaseCostDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#LeasesMaturitiesofOperatingLeaseLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails" xlink:type="extended" id="ibca15f28806541ec9bbcd014da0eca54_LeasesMaturitiesofOperatingLeaseLiabilitiesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2b5b7cd3-f19a-423f-bff3-77e0058f0874" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_40bef7cc-a452-44d3-9486-ec0d94ec6849" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2b5b7cd3-f19a-423f-bff3-77e0058f0874" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear_40bef7cc-a452-44d3-9486-ec0d94ec6849" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_b3b8e684-f75e-4cd7-9bd7-7969539f7e42" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2b5b7cd3-f19a-423f-bff3-77e0058f0874" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_b3b8e684-f75e-4cd7-9bd7-7969539f7e42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_613ff407-ebbc-45ed-a6b5-78693ece64eb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2b5b7cd3-f19a-423f-bff3-77e0058f0874" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_613ff407-ebbc-45ed-a6b5-78693ece64eb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_46375727-8d7f-4781-92ef-ba1c7c99b962" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2b5b7cd3-f19a-423f-bff3-77e0058f0874" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_46375727-8d7f-4781-92ef-ba1c7c99b962" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_58e99e4d-c278-4942-86d1-cd37904c1909" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2b5b7cd3-f19a-423f-bff3-77e0058f0874" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_58e99e4d-c278-4942-86d1-cd37904c1909" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_6c0f0301-403e-4165-a93b-9a5c4e3338c6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2b5b7cd3-f19a-423f-bff3-77e0058f0874" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_6c0f0301-403e-4165-a93b-9a5c4e3338c6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_f887cdf1-dd5a-4ac0-ae68-90272be59f8d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2b5b7cd3-f19a-423f-bff3-77e0058f0874" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_f887cdf1-dd5a-4ac0-ae68-90272be59f8d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_024e41ca-992f-4a0c-9aa8-6fb04c6ad6d3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2b5b7cd3-f19a-423f-bff3-77e0058f0874" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_024e41ca-992f-4a0c-9aa8-6fb04c6ad6d3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_f211ddd0-7acd-4cb1-a6bb-935d1da42d1e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2b5b7cd3-f19a-423f-bff3-77e0058f0874" xlink:to="loc_us-gaap_OperatingLeaseLiability_f211ddd0-7acd-4cb1-a6bb-935d1da42d1e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_463a011e-ce6f-404b-a861-2f87ceea247b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_2b5b7cd3-f19a-423f-bff3-77e0058f0874" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_463a011e-ce6f-404b-a861-2f87ceea247b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_a0c047b8-b2dc-4289-94c0-95effc774e9c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_463a011e-ce6f-404b-a861-2f87ceea247b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_a0c047b8-b2dc-4289-94c0-95effc774e9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a0c047b8-b2dc-4289-94c0-95effc774e9c_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_a0c047b8-b2dc-4289-94c0-95effc774e9c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a0c047b8-b2dc-4289-94c0-95effc774e9c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_29e3c6f2-eea2-40d5-8dd6-90d83d0c4c96" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_a0c047b8-b2dc-4289-94c0-95effc774e9c" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_29e3c6f2-eea2-40d5-8dd6-90d83d0c4c96" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_RealEstateArrangementsMember_ce6340a9-8bd6-41f4-b8ba-521fd7d7f1de" xlink:href="crwd-20201031.xsd#crwd_RealEstateArrangementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_29e3c6f2-eea2-40d5-8dd6-90d83d0c4c96" xlink:to="loc_crwd_RealEstateArrangementsMember_ce6340a9-8bd6-41f4-b8ba-521fd7d7f1de" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/EquityTransactions" xlink:type="simple" xlink:href="crwd-20201031.xsd#EquityTransactions"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/EquityTransactions" xlink:type="extended" id="i6b40cbbc997e49158667b61677f03358_EquityTransactions"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/EquityTransactionsDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#EquityTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/EquityTransactionsDetails" xlink:type="extended" id="ife057b15e8254abbaa597f47ee3ad3dc_EquityTransactionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_fc006bfa-9eca-4e04-a743-9ba8e6a0055b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_b57ffcdd-d03d-46ee-aea7-0fc4bf87bba2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_fc006bfa-9eca-4e04-a743-9ba8e6a0055b" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_b57ffcdd-d03d-46ee-aea7-0fc4bf87bba2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_f6339166-c688-4f78-a26c-699805c6dc59" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_fc006bfa-9eca-4e04-a743-9ba8e6a0055b" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_f6339166-c688-4f78-a26c-699805c6dc59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_ed440110-ac69-4853-81b1-37265c129ba4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_fc006bfa-9eca-4e04-a743-9ba8e6a0055b" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_ed440110-ac69-4853-81b1-37265c129ba4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_888ad992-63c2-4a3b-8ee7-a697f1ff94a8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_fc006bfa-9eca-4e04-a743-9ba8e6a0055b" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_888ad992-63c2-4a3b-8ee7-a697f1ff94a8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_NumberOfVotesPerShare_8d550274-8eb6-470a-a5c6-1932030849b6" xlink:href="crwd-20201031.xsd#crwd_NumberOfVotesPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_fc006bfa-9eca-4e04-a743-9ba8e6a0055b" xlink:to="loc_crwd_NumberOfVotesPerShare_8d550274-8eb6-470a-a5c6-1932030849b6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockConversionCommonStockConversionRatio_18821db3-de7c-4d34-a7ab-96fc050fcf25" xlink:href="crwd-20201031.xsd#crwd_StockConversionCommonStockConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_fc006bfa-9eca-4e04-a743-9ba8e6a0055b" xlink:to="loc_crwd_StockConversionCommonStockConversionRatio_18821db3-de7c-4d34-a7ab-96fc050fcf25" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_7c291bc3-65c4-4d9e-a44f-05a17afc0781" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_fc006bfa-9eca-4e04-a743-9ba8e6a0055b" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_7c291bc3-65c4-4d9e-a44f-05a17afc0781" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_55a714ff-c64e-46db-917a-782649719791" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_7c291bc3-65c4-4d9e-a44f-05a17afc0781" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_55a714ff-c64e-46db-917a-782649719791" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_55a714ff-c64e-46db-917a-782649719791_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_55a714ff-c64e-46db-917a-782649719791" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_55a714ff-c64e-46db-917a-782649719791_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_f4f8df9f-def5-40ca-907f-9109e85d2f22" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_55a714ff-c64e-46db-917a-782649719791" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_f4f8df9f-def5-40ca-907f-9109e85d2f22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IPOMember_3b581f15-d663-4b80-9859-792cbf7cb96a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IPOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_f4f8df9f-def5-40ca-907f-9109e85d2f22" xlink:to="loc_us-gaap_IPOMember_3b581f15-d663-4b80-9859-792cbf7cb96a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_8b8bc8f6-32f8-466f-b3c6-1f33244977f4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_7c291bc3-65c4-4d9e-a44f-05a17afc0781" xlink:to="loc_us-gaap_StatementClassOfStockAxis_8b8bc8f6-32f8-466f-b3c6-1f33244977f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_8b8bc8f6-32f8-466f-b3c6-1f33244977f4_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_8b8bc8f6-32f8-466f-b3c6-1f33244977f4" xlink:to="loc_us-gaap_ClassOfStockDomain_8b8bc8f6-32f8-466f-b3c6-1f33244977f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_8820e853-4cf8-4a35-998e-729c3e722302" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_8b8bc8f6-32f8-466f-b3c6-1f33244977f4" xlink:to="loc_us-gaap_ClassOfStockDomain_8820e853-4cf8-4a35-998e-729c3e722302" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_49d79dc9-e279-461b-b930-573bb14216ef" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_8820e853-4cf8-4a35-998e-729c3e722302" xlink:to="loc_us-gaap_CommonClassAMember_49d79dc9-e279-461b-b930-573bb14216ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_736be186-17e8-4f55-b317-e2f95bd4ab6c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_8820e853-4cf8-4a35-998e-729c3e722302" xlink:to="loc_us-gaap_CommonClassBMember_736be186-17e8-4f55-b317-e2f95bd4ab6c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensation" xlink:type="simple" xlink:href="crwd-20201031.xsd#StockBasedCompensation"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensation" xlink:type="extended" id="ia9416f65209048c491a840ed48986202_StockBasedCompensation"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensationTables" xlink:type="simple" xlink:href="crwd-20201031.xsd#StockBasedCompensationTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensationTables" xlink:type="extended" id="i4a04ab51d0e64237b12e877a0dd9278b_StockBasedCompensationTables">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6b8853cd-5bed-4015-a63f-db29c6af0562" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_6f9bd29a-cfa6-422a-8c42-267f7a12b1b6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6b8853cd-5bed-4015-a63f-db29c6af0562" xlink:to="loc_us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock_6f9bd29a-cfa6-422a-8c42-267f7a12b1b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_995bbb78-7408-4a3e-8878-639984c32f30" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6b8853cd-5bed-4015-a63f-db29c6af0562" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_995bbb78-7408-4a3e-8878-639984c32f30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_80cf3edb-00a0-4fa7-a004-8d0c2b116041" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6b8853cd-5bed-4015-a63f-db29c6af0562" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock_80cf3edb-00a0-4fa7-a004-8d0c2b116041" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_9c837a92-14f6-411c-acb5-eadc3d0be2ff" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6b8853cd-5bed-4015-a63f-db29c6af0562" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_9c837a92-14f6-411c-acb5-eadc3d0be2ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_947bc2cf-d72e-434d-acc0-1f9490d51bb8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6b8853cd-5bed-4015-a63f-db29c6af0562" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_947bc2cf-d72e-434d-acc0-1f9490d51bb8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_97a60068-ac74-4e6b-84af-825a27c0ff06" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_947bc2cf-d72e-434d-acc0-1f9490d51bb8" xlink:to="loc_us-gaap_AwardTypeAxis_97a60068-ac74-4e6b-84af-825a27c0ff06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_97a60068-ac74-4e6b-84af-825a27c0ff06_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_97a60068-ac74-4e6b-84af-825a27c0ff06" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_97a60068-ac74-4e6b-84af-825a27c0ff06_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_22046aa8-ff14-4510-b10c-e10e3d949c6c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_97a60068-ac74-4e6b-84af-825a27c0ff06" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_22046aa8-ff14-4510-b10c-e10e3d949c6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_a2d0b22b-5a20-4785-b7f2-17d598c5f75d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_22046aa8-ff14-4510-b10c-e10e3d949c6c" xlink:to="loc_us-gaap_EmployeeStockOptionMember_a2d0b22b-5a20-4785-b7f2-17d598c5f75d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_0561914f-9070-434f-8710-f3c2e0c34095" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_947bc2cf-d72e-434d-acc0-1f9490d51bb8" xlink:to="loc_us-gaap_PlanNameAxis_0561914f-9070-434f-8710-f3c2e0c34095" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_0561914f-9070-434f-8710-f3c2e0c34095_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_0561914f-9070-434f-8710-f3c2e0c34095" xlink:to="loc_us-gaap_PlanNameDomain_0561914f-9070-434f-8710-f3c2e0c34095_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_fe95bb6f-07db-4d5b-82fb-80c4ebe005f9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_0561914f-9070-434f-8710-f3c2e0c34095" xlink:to="loc_us-gaap_PlanNameDomain_fe95bb6f-07db-4d5b-82fb-80c4ebe005f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanMember_d208cbf8-1d05-4199-aeda-d4c1c268fed7" xlink:href="crwd-20201031.xsd#crwd_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_fe95bb6f-07db-4d5b-82fb-80c4ebe005f9" xlink:to="loc_crwd_EmployeeStockPurchasePlanMember_d208cbf8-1d05-4199-aeda-d4c1c268fed7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensationDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#StockBasedCompensationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensationDetails" xlink:type="extended" id="i3bf9ec1f33be45748846d1b88a6840ce_StockBasedCompensationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_1f132887-4fac-47e1-9fa9-c9e7bbbeef66" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_1f132887-4fac-47e1-9fa9-c9e7bbbeef66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_851e64d0-ffd6-418a-86b2-e06a1a43478c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_851e64d0-ffd6-418a-86b2-e06a1a43478c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_fb631ad2-8cf6-4414-9a85-49cff613676c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares_fb631ad2-8cf6-4414-9a85-49cff613676c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_bf103535-8a36-420e-8320-5d1bee99eef9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_bf103535-8a36-420e-8320-5d1bee99eef9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_410657b3-d7dd-437f-9fcc-290455a20716" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_410657b3-d7dd-437f-9fcc-290455a20716" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_e57d2928-c791-40a6-81d6-cfe603da7d93" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_e57d2928-c791-40a6-81d6-cfe603da7d93" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_6d1d7ab0-e647-4b5a-b824-718864cf7c74" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_6d1d7ab0-e647-4b5a-b824-718864cf7c74" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_fff7f2e3-d151-4a79-a915-6640ff80cb45" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_fff7f2e3-d151-4a79-a915-6640ff80cb45" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_e6ada505-0fda-4dd8-b801-344889c0678b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_e6ada505-0fda-4dd8-b801-344889c0678b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_44c8326b-412c-45d2-ad08-9008e847e3bd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_44c8326b-412c-45d2-ad08-9008e847e3bd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_77a4312b-1ac0-4430-882f-78f010ddb1e4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_77a4312b-1ac0-4430-882f-78f010ddb1e4" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_59ecda0f-80c3-4960-af51-022b76b811bd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_59ecda0f-80c3-4960-af51-022b76b811bd" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockIssuedDuringPeriodSharesEarlyExerciseOfEmployeeOptions_d8e96cd7-3d98-4805-b037-dec39efdc58d" xlink:href="crwd-20201031.xsd#crwd_StockIssuedDuringPeriodSharesEarlyExerciseOfEmployeeOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_crwd_StockIssuedDuringPeriodSharesEarlyExerciseOfEmployeeOptions_d8e96cd7-3d98-4805-b037-dec39efdc58d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockIssuedDuringPeriodSharesEarlyStockOptionsExercised_c6e68067-d218-4b7a-9b08-7dace9e1fdee" xlink:href="crwd-20201031.xsd#crwd_StockIssuedDuringPeriodSharesEarlyStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_crwd_StockIssuedDuringPeriodSharesEarlyStockOptionsExercised_c6e68067-d218-4b7a-9b08-7dace9e1fdee" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNumberOfSharesRelatedToEarlyExercisedStockOptionsSubjectToRepurchase_d4006f13-540c-4805-97f5-de63f37f11c5" xlink:href="crwd-20201031.xsd#crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNumberOfSharesRelatedToEarlyExercisedStockOptionsSubjectToRepurchase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNumberOfSharesRelatedToEarlyExercisedStockOptionsSubjectToRepurchase_d4006f13-540c-4805-97f5-de63f37f11c5" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsValueRelatedToEarlyExercisedStockOptionsSubjectToRepurchase_93317110-827a-45fd-9f77-74e02a70ee8e" xlink:href="crwd-20201031.xsd#crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsValueRelatedToEarlyExercisedStockOptionsSubjectToRepurchase"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_crwd_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsValueRelatedToEarlyExercisedStockOptionsSubjectToRepurchase_93317110-827a-45fd-9f77-74e02a70ee8e" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_VestingScheduleNumber_71bea60b-9925-4654-827f-860749f1fd72" xlink:href="crwd-20201031.xsd#crwd_VestingScheduleNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_crwd_VestingScheduleNumber_71bea60b-9925-4654-827f-860749f1fd72" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_99b59321-f1c8-4060-a8a8-5544cdf8088b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_99b59321-f1c8-4060-a8a8-5544cdf8088b" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfQuarterlyInstallments_309df964-a59f-4ccc-8831-477fb03fdb93" xlink:href="crwd-20201031.xsd#crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfQuarterlyInstallments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfQuarterlyInstallments_309df964-a59f-4ccc-8831-477fb03fdb93" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_6dd9f699-3e2c-4aea-a8bc-09174d6f08ff" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_DeferredCompensationSharebasedArrangementsLiabilityCurrentAndNoncurrent_6dd9f699-3e2c-4aea-a8bc-09174d6f08ff" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_07f0f1c2-589f-42f2-acd8-7025fe63aa2d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_07f0f1c2-589f-42f2-acd8-7025fe63aa2d" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_b72d902f-97bd-407a-b11b-fe9dae1913ab" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum_1f3e89f2-a087-4237-a83e-e95a24840a2e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanOfferingPeriod_f5c80876-2123-4f10-8246-0748b9631bda" xlink:href="crwd-20201031.xsd#crwd_EmployeeStockPurchasePlanOfferingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_crwd_EmployeeStockPurchasePlanOfferingPeriod_f5c80876-2123-4f10-8246-0748b9631bda" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanNumberOfPurchasePeriod_b0e20857-e41b-4bb9-aa19-01659dafa046" xlink:href="crwd-20201031.xsd#crwd_EmployeeStockPurchasePlanNumberOfPurchasePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_crwd_EmployeeStockPurchasePlanNumberOfPurchasePeriod_b0e20857-e41b-4bb9-aa19-01659dafa046" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanDurationOfPurchasePeriod_62dd6860-4a98-4e90-b040-39fed62c7b47" xlink:href="crwd-20201031.xsd#crwd_EmployeeStockPurchasePlanDurationOfPurchasePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_crwd_EmployeeStockPurchasePlanDurationOfPurchasePeriod_62dd6860-4a98-4e90-b040-39fed62c7b47" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanPercentageOfEligibleCompensation_2b26f3fb-39dc-449c-9c0c-be5666f454bf" xlink:href="crwd-20201031.xsd#crwd_EmployeeStockPurchasePlanPercentageOfEligibleCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_crwd_EmployeeStockPurchasePlanPercentageOfEligibleCompensation_2b26f3fb-39dc-449c-9c0c-be5666f454bf" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_MaximumNumberOfSharesEachParticipantCanPurchaseDuringPurchasePeriod_7ebd0cc0-c0c4-4863-aa98-8698a58d3239" xlink:href="crwd-20201031.xsd#crwd_MaximumNumberOfSharesEachParticipantCanPurchaseDuringPurchasePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_crwd_MaximumNumberOfSharesEachParticipantCanPurchaseDuringPurchasePeriod_7ebd0cc0-c0c4-4863-aa98-8698a58d3239" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_3293945b-c1c5-4736-8c9f-f8ed7fd94bf4" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_3293945b-c1c5-4736-8c9f-f8ed7fd94bf4" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_0fdf3245-3e11-4ae6-9ff8-62af41e0d51a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_0fdf3245-3e11-4ae6-9ff8-62af41e0d51a" xlink:type="arc" order="29"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ShareBasedPaymentArrangementPlanModificationNumberOfContributionChanges_f5725bdc-b962-4756-b513-b1a35bd19c2a" xlink:href="crwd-20201031.xsd#crwd_ShareBasedPaymentArrangementPlanModificationNumberOfContributionChanges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_crwd_ShareBasedPaymentArrangementPlanModificationNumberOfContributionChanges_f5725bdc-b962-4756-b513-b1a35bd19c2a" xlink:type="arc" order="30"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_03e8b324-ccea-48a6-8400-57414447b3dd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost_03e8b324-ccea-48a6-8400-57414447b3dd" xlink:type="arc" order="31"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_dba330de-e135-43c4-85c6-98f7c7cef5a9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_d4c81767-2d90-42bf-b83c-5aff0e488652" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_dba330de-e135-43c4-85c6-98f7c7cef5a9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingAxis_e0fdaf36-b6b0-4295-8062-7d253e9eab88" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VestingAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_dba330de-e135-43c4-85c6-98f7c7cef5a9" xlink:to="loc_us-gaap_VestingAxis_e0fdaf36-b6b0-4295-8062-7d253e9eab88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_e0fdaf36-b6b0-4295-8062-7d253e9eab88_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_e0fdaf36-b6b0-4295-8062-7d253e9eab88" xlink:to="loc_us-gaap_VestingDomain_e0fdaf36-b6b0-4295-8062-7d253e9eab88_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VestingDomain_c207809b-a034-4480-83b8-9318180eb553" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_VestingDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_e0fdaf36-b6b0-4295-8062-7d253e9eab88" xlink:to="loc_us-gaap_VestingDomain_c207809b-a034-4480-83b8-9318180eb553" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_00a52009-afa8-49b3-b126-c6dc31599c7e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_c207809b-a034-4480-83b8-9318180eb553" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheOneMember_00a52009-afa8-49b3-b126-c6dc31599c7e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_e0a794fc-91d1-4df6-908b-ca2e15869b1b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_c207809b-a034-4480-83b8-9318180eb553" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheTwoMember_e0a794fc-91d1-4df6-908b-ca2e15869b1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_8fc0fd19-81a0-4f24-8039-450ae5eab70a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationAwardTrancheThreeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_c207809b-a034-4480-83b8-9318180eb553" xlink:to="loc_us-gaap_ShareBasedCompensationAwardTrancheThreeMember_8fc0fd19-81a0-4f24-8039-450ae5eab70a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_d680945b-d99c-47f3-aaec-9a015db179e2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_dba330de-e135-43c4-85c6-98f7c7cef5a9" xlink:to="loc_us-gaap_AwardTypeAxis_d680945b-d99c-47f3-aaec-9a015db179e2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d680945b-d99c-47f3-aaec-9a015db179e2_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_d680945b-d99c-47f3-aaec-9a015db179e2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_d680945b-d99c-47f3-aaec-9a015db179e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b0232e8e-2bda-4bdb-8ab1-69ae31cda4d2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_d680945b-d99c-47f3-aaec-9a015db179e2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b0232e8e-2bda-4bdb-8ab1-69ae31cda4d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ServiceBasedRestrictedStockUnitsVestingMember_a2664e57-3c6a-498f-a2a0-e48e0c708b1f" xlink:href="crwd-20201031.xsd#crwd_ServiceBasedRestrictedStockUnitsVestingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b0232e8e-2bda-4bdb-8ab1-69ae31cda4d2" xlink:to="loc_crwd_ServiceBasedRestrictedStockUnitsVestingMember_a2664e57-3c6a-498f-a2a0-e48e0c708b1f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_2a64d85b-c660-401b-b203-c569a8c88f3d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b0232e8e-2bda-4bdb-8ab1-69ae31cda4d2" xlink:to="loc_us-gaap_EmployeeStockOptionMember_2a64d85b-c660-401b-b203-c569a8c88f3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PerformanceBasedRestrictedStockUnitsVestingMember_22c6d150-332b-4f3a-9bb8-4a059ef99cd3" xlink:href="crwd-20201031.xsd#crwd_PerformanceBasedRestrictedStockUnitsVestingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b0232e8e-2bda-4bdb-8ab1-69ae31cda4d2" xlink:to="loc_crwd_PerformanceBasedRestrictedStockUnitsVestingMember_22c6d150-332b-4f3a-9bb8-4a059ef99cd3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_aff0b7a1-8484-411a-a6fd-6d99cb0f67c6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b0232e8e-2bda-4bdb-8ab1-69ae31cda4d2" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_aff0b7a1-8484-411a-a6fd-6d99cb0f67c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PerformanceBasedStockUnitsMember_c7cdf903-6001-468e-907b-dfab6c5aeadf" xlink:href="crwd-20201031.xsd#crwd_PerformanceBasedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_b0232e8e-2bda-4bdb-8ab1-69ae31cda4d2" xlink:to="loc_crwd_PerformanceBasedStockUnitsMember_c7cdf903-6001-468e-907b-dfab6c5aeadf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_a3305211-0f06-410a-bbb3-746a68949e22" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_dba330de-e135-43c4-85c6-98f7c7cef5a9" xlink:to="loc_us-gaap_PlanNameAxis_a3305211-0f06-410a-bbb3-746a68949e22" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_a3305211-0f06-410a-bbb3-746a68949e22_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_a3305211-0f06-410a-bbb3-746a68949e22" xlink:to="loc_us-gaap_PlanNameDomain_a3305211-0f06-410a-bbb3-746a68949e22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_dcacfaca-b619-4c59-9e64-150b0de4dcfd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_a3305211-0f06-410a-bbb3-746a68949e22" xlink:to="loc_us-gaap_PlanNameDomain_dcacfaca-b619-4c59-9e64-150b0de4dcfd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EquityIncentivePlan2019Member_d1973734-712e-4475-8f38-062b454c5957" xlink:href="crwd-20201031.xsd#crwd_EquityIncentivePlan2019Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_dcacfaca-b619-4c59-9e64-150b0de4dcfd" xlink:to="loc_crwd_EquityIncentivePlan2019Member_d1973734-712e-4475-8f38-062b454c5957" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanMember_09a77658-071d-4fa8-88b0-1f195d5e0382" xlink:href="crwd-20201031.xsd#crwd_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_dcacfaca-b619-4c59-9e64-150b0de4dcfd" xlink:to="loc_crwd_EmployeeStockPurchasePlanMember_09a77658-071d-4fa8-88b0-1f195d5e0382" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_2519c56a-8c03-4886-88d8-ea83ac404846" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_dba330de-e135-43c4-85c6-98f7c7cef5a9" xlink:to="loc_us-gaap_StatementClassOfStockAxis_2519c56a-8c03-4886-88d8-ea83ac404846" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_2519c56a-8c03-4886-88d8-ea83ac404846_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_2519c56a-8c03-4886-88d8-ea83ac404846" xlink:to="loc_us-gaap_ClassOfStockDomain_2519c56a-8c03-4886-88d8-ea83ac404846_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_321bdcdf-d3d8-4645-a737-89784e1f7968" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_2519c56a-8c03-4886-88d8-ea83ac404846" xlink:to="loc_us-gaap_ClassOfStockDomain_321bdcdf-d3d8-4645-a737-89784e1f7968" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_3f295c8b-557c-401c-b31b-a5a9a0f3881a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_321bdcdf-d3d8-4645-a737-89784e1f7968" xlink:to="loc_us-gaap_CommonClassAMember_3f295c8b-557c-401c-b31b-a5a9a0f3881a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d093ebd1-b567-478c-8ed8-ef2e929118a3" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_dba330de-e135-43c4-85c6-98f7c7cef5a9" xlink:to="loc_srt_RangeAxis_d093ebd1-b567-478c-8ed8-ef2e929118a3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d093ebd1-b567-478c-8ed8-ef2e929118a3_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d093ebd1-b567-478c-8ed8-ef2e929118a3" xlink:to="loc_srt_RangeMember_d093ebd1-b567-478c-8ed8-ef2e929118a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_740e73a7-5d43-46b7-8f49-cf1d77372401" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d093ebd1-b567-478c-8ed8-ef2e929118a3" xlink:to="loc_srt_RangeMember_740e73a7-5d43-46b7-8f49-cf1d77372401" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_b0884cfa-b311-4847-bfa3-d37120d2325e" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_740e73a7-5d43-46b7-8f49-cf1d77372401" xlink:to="loc_srt_MinimumMember_b0884cfa-b311-4847-bfa3-d37120d2325e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_6448631b-c345-4d9d-a42b-e765a234037f" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_740e73a7-5d43-46b7-8f49-cf1d77372401" xlink:to="loc_srt_MaximumMember_6448631b-c345-4d9d-a42b-e765a234037f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_9457ebae-8d38-48ca-aac5-8a4aaade00eb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_dba330de-e135-43c4-85c6-98f7c7cef5a9" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_9457ebae-8d38-48ca-aac5-8a4aaade00eb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_9457ebae-8d38-48ca-aac5-8a4aaade00eb_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_9457ebae-8d38-48ca-aac5-8a4aaade00eb" xlink:to="loc_us-gaap_EquityComponentDomain_9457ebae-8d38-48ca-aac5-8a4aaade00eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_a3700f7f-b9fa-4980-96b7-c02df9d203a8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_9457ebae-8d38-48ca-aac5-8a4aaade00eb" xlink:to="loc_us-gaap_EquityComponentDomain_a3700f7f-b9fa-4980-96b7-c02df9d203a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_11c674d8-c52d-4a48-a3b3-0ab9f4f6c6e3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_a3700f7f-b9fa-4980-96b7-c02df9d203a8" xlink:to="loc_us-gaap_CommonStockMember_11c674d8-c52d-4a48-a3b3-0ab9f4f6c6e3" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensationStockoptionsAssumptionsDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#StockBasedCompensationStockoptionsAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensationStockoptionsAssumptionsDetails" xlink:type="extended" id="ibcd0119f1f3e4ea8858678526749adc7_StockBasedCompensationStockoptionsAssumptionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6f8eab1c-711d-408e-a546-28b176b3c37c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_9638127b-9d99-42f2-abe5-1024be9178f7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6f8eab1c-711d-408e-a546-28b176b3c37c" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_9638127b-9d99-42f2-abe5-1024be9178f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_d5a5dc6c-606f-415f-8cb2-0a2cf6f1a8d3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6f8eab1c-711d-408e-a546-28b176b3c37c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_d5a5dc6c-606f-415f-8cb2-0a2cf6f1a8d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_70f1476d-cf4d-4b3c-84ea-f28b135442c2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6f8eab1c-711d-408e-a546-28b176b3c37c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_70f1476d-cf4d-4b3c-84ea-f28b135442c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_1e9a2b3a-53e0-4746-9bea-af2e5979eb4e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6f8eab1c-711d-408e-a546-28b176b3c37c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_1e9a2b3a-53e0-4746-9bea-af2e5979eb4e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d90ca550-dddd-41ad-b9e0-47f77ee61e70" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_6f8eab1c-711d-408e-a546-28b176b3c37c" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d90ca550-dddd-41ad-b9e0-47f77ee61e70" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_56ff5ecf-5ec8-40d0-b5b1-cefe61d383df" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d90ca550-dddd-41ad-b9e0-47f77ee61e70" xlink:to="loc_srt_RangeAxis_56ff5ecf-5ec8-40d0-b5b1-cefe61d383df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_56ff5ecf-5ec8-40d0-b5b1-cefe61d383df_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_56ff5ecf-5ec8-40d0-b5b1-cefe61d383df" xlink:to="loc_srt_RangeMember_56ff5ecf-5ec8-40d0-b5b1-cefe61d383df_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_29abdb96-630b-46ae-a029-9fb13f4566de" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_56ff5ecf-5ec8-40d0-b5b1-cefe61d383df" xlink:to="loc_srt_RangeMember_29abdb96-630b-46ae-a029-9fb13f4566de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_2bafc30b-3eeb-4975-a930-602606dc1172" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_29abdb96-630b-46ae-a029-9fb13f4566de" xlink:to="loc_srt_MinimumMember_2bafc30b-3eeb-4975-a930-602606dc1172" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_29a11bef-f88f-467b-8ff2-f38743b7a56b" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_29abdb96-630b-46ae-a029-9fb13f4566de" xlink:to="loc_srt_MaximumMember_29a11bef-f88f-467b-8ff2-f38743b7a56b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_987e1aad-e305-4974-b762-d4090b925f58" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d90ca550-dddd-41ad-b9e0-47f77ee61e70" xlink:to="loc_us-gaap_PlanNameAxis_987e1aad-e305-4974-b762-d4090b925f58" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_987e1aad-e305-4974-b762-d4090b925f58_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_987e1aad-e305-4974-b762-d4090b925f58" xlink:to="loc_us-gaap_PlanNameDomain_987e1aad-e305-4974-b762-d4090b925f58_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_6b2a419c-d7e1-422f-97df-85f1154f63c5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_987e1aad-e305-4974-b762-d4090b925f58" xlink:to="loc_us-gaap_PlanNameDomain_6b2a419c-d7e1-422f-97df-85f1154f63c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_EmployeeStockPurchasePlanMember_8db34988-01e0-493b-933e-6f0c75bb95e3" xlink:href="crwd-20201031.xsd#crwd_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_6b2a419c-d7e1-422f-97df-85f1154f63c5" xlink:to="loc_crwd_EmployeeStockPurchasePlanMember_8db34988-01e0-493b-933e-6f0c75bb95e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_f843616d-9345-49b7-bb06-5bac322d3879" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_d90ca550-dddd-41ad-b9e0-47f77ee61e70" xlink:to="loc_us-gaap_AwardTypeAxis_f843616d-9345-49b7-bb06-5bac322d3879" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f843616d-9345-49b7-bb06-5bac322d3879_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_f843616d-9345-49b7-bb06-5bac322d3879" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f843616d-9345-49b7-bb06-5bac322d3879_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ffe9638a-590f-4fd1-806b-f53c7ff10ca1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_f843616d-9345-49b7-bb06-5bac322d3879" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ffe9638a-590f-4fd1-806b-f53c7ff10ca1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_c4bf847a-8206-4e7a-8049-05154e89b1c1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ffe9638a-590f-4fd1-806b-f53c7ff10ca1" xlink:to="loc_us-gaap_EmployeeStockOptionMember_c4bf847a-8206-4e7a-8049-05154e89b1c1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensationStockoptionsSummaryDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#StockBasedCompensationStockoptionsSummaryDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensationStockoptionsSummaryDetails" xlink:type="extended" id="i16b437041ea74ef6bc80d6aa5e38c53c_StockBasedCompensationStockoptionsSummaryDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ed93cf1c-85f8-4d1a-bfd1-a1311a248ff2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_390e408e-a4d8-4126-81ff-b757c245ad76" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ed93cf1c-85f8-4d1a-bfd1-a1311a248ff2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_390e408e-a4d8-4126-81ff-b757c245ad76" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_a52caf19-4a70-42da-9dd6-5cf96c26ab5a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_390e408e-a4d8-4126-81ff-b757c245ad76" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_a52caf19-4a70-42da-9dd6-5cf96c26ab5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_f0c5c57f-b9e8-4c4d-8243-645ea133c072" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_390e408e-a4d8-4126-81ff-b757c245ad76" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross_f0c5c57f-b9e8-4c4d-8243-645ea133c072" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_c21b6aa3-d95e-488a-be8e-c1ec36c917e2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_390e408e-a4d8-4126-81ff-b757c245ad76" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_c21b6aa3-d95e-488a-be8e-c1ec36c917e2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_4fc6f916-29c0-4741-8fc7-939dc61a8f2a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_390e408e-a4d8-4126-81ff-b757c245ad76" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_4fc6f916-29c0-4741-8fc7-939dc61a8f2a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber_ea2edcbc-39b8-4325-a920-caffb4b16bbd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_bb1d2a9b-5198-44b8-bb70-8c0c830e7f56" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_390e408e-a4d8-4126-81ff-b757c245ad76" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber_bb1d2a9b-5198-44b8-bb70-8c0c830e7f56" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_45bed0d5-19e2-4331-a28f-a05b97bb68f1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_390e408e-a4d8-4126-81ff-b757c245ad76" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_45bed0d5-19e2-4331-a28f-a05b97bb68f1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5d3685e4-eac5-4057-b9c3-a7d6a69e78b6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ed93cf1c-85f8-4d1a-bfd1-a1311a248ff2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5d3685e4-eac5-4057-b9c3-a7d6a69e78b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_37740622-7e20-4c39-a48b-9a30f852e1f3" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5d3685e4-eac5-4057-b9c3-a7d6a69e78b6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_37740622-7e20-4c39-a48b-9a30f852e1f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_6bad9393-2d65-40ae-8b4b-5f46408d35da" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5d3685e4-eac5-4057-b9c3-a7d6a69e78b6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice_6bad9393-2d65-40ae-8b4b-5f46408d35da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_699d4236-b4e2-41be-8519-45ac57be86ae" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5d3685e4-eac5-4057-b9c3-a7d6a69e78b6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice_699d4236-b4e2-41be-8519-45ac57be86ae" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_e361425f-7d23-4b0f-9153-513f8655b900" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5d3685e4-eac5-4057-b9c3-a7d6a69e78b6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_e361425f-7d23-4b0f-9153-513f8655b900" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_30032d79-d442-4ab0-a5cb-6c70ba6574ca" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_6217d1eb-a207-4abc-8689-db6deb3ffd21" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5d3685e4-eac5-4057-b9c3-a7d6a69e78b6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice_6217d1eb-a207-4abc-8689-db6deb3ffd21" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_fb7c431f-005c-4101-819c-2a68d9d02256" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_5d3685e4-eac5-4057-b9c3-a7d6a69e78b6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_fb7c431f-005c-4101-819c-2a68d9d02256" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_af8f6d44-557d-4b3f-9792-71df868520d9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ed93cf1c-85f8-4d1a-bfd1-a1311a248ff2" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_af8f6d44-557d-4b3f-9792-71df868520d9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_1e3162e4-a1f2-4f97-ab39-06737f949561" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_af8f6d44-557d-4b3f-9792-71df868520d9" xlink:to="loc_us-gaap_AwardTypeAxis_1e3162e4-a1f2-4f97-ab39-06737f949561" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1e3162e4-a1f2-4f97-ab39-06737f949561_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_1e3162e4-a1f2-4f97-ab39-06737f949561" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_1e3162e4-a1f2-4f97-ab39-06737f949561_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4574c48e-67bd-4da0-970e-690635ce59af" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_1e3162e4-a1f2-4f97-ab39-06737f949561" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4574c48e-67bd-4da0-970e-690635ce59af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_9eb7bdb8-2030-433d-bccb-73cddff58770" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_4574c48e-67bd-4da0-970e-690635ce59af" xlink:to="loc_us-gaap_EmployeeStockOptionMember_9eb7bdb8-2030-433d-bccb-73cddff58770" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensationRSUactivityDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#StockBasedCompensationRSUactivityDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensationRSUactivityDetails" xlink:type="extended" id="ida6feac9cfa545d1b759447c8141f36a_StockBasedCompensationRSUactivityDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_faf51755-af98-4df3-9a7e-b6177a2f436e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_896ea9bb-55f9-4f28-af85-dc28a9254104" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_faf51755-af98-4df3-9a7e-b6177a2f436e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_896ea9bb-55f9-4f28-af85-dc28a9254104" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_d9f1baa1-3f96-418f-8185-c0f0893bab13" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_896ea9bb-55f9-4f28-af85-dc28a9254104" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_d9f1baa1-3f96-418f-8185-c0f0893bab13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_91c00582-e3b6-478f-8bee-3db28b505a98" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_896ea9bb-55f9-4f28-af85-dc28a9254104" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_91c00582-e3b6-478f-8bee-3db28b505a98" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_4a562a5c-41e3-480d-aead-e259f7dfcb06" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_896ea9bb-55f9-4f28-af85-dc28a9254104" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_4a562a5c-41e3-480d-aead-e259f7dfcb06" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_03330457-e8b1-4513-966d-7830953c48c2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_896ea9bb-55f9-4f28-af85-dc28a9254104" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_03330457-e8b1-4513-966d-7830953c48c2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_57053ef1-866f-442a-b207-f506b7c1f73c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestNumber_4c6f8508-478e-411d-ac0e-c800e9af5237" xlink:href="crwd-20201031.xsd#crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_896ea9bb-55f9-4f28-af85-dc28a9254104" xlink:to="loc_crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestNumber_4c6f8508-478e-411d-ac0e-c800e9af5237" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_d1b69a08-7394-4f0f-b3cf-1de200fbba09" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_faf51755-af98-4df3-9a7e-b6177a2f436e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_d1b69a08-7394-4f0f-b3cf-1de200fbba09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_66fed23e-f4a0-4fd4-bcfd-a1b64b35e74b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_d1b69a08-7394-4f0f-b3cf-1de200fbba09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_66fed23e-f4a0-4fd4-bcfd-a1b64b35e74b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_6c5e5777-ab7e-4117-b2c2-b1711f680f32" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_d1b69a08-7394-4f0f-b3cf-1de200fbba09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_6c5e5777-ab7e-4117-b2c2-b1711f680f32" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_f542e4a9-8874-4758-a53d-e074549f51df" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_d1b69a08-7394-4f0f-b3cf-1de200fbba09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_f542e4a9-8874-4758-a53d-e074549f51df" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_e6a2db0b-3721-4e70-9605-988113ef2745" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_d1b69a08-7394-4f0f-b3cf-1de200fbba09" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_e6a2db0b-3721-4e70-9605-988113ef2745" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_fb4d1327-4f65-493b-b760-62785aad567f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue_7246c79c-30d5-42dd-8a6a-6be9f2f99fb4" xlink:href="crwd-20201031.xsd#crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_d1b69a08-7394-4f0f-b3cf-1de200fbba09" xlink:to="loc_crwd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestWeightedAverageGrantDateFairValue_7246c79c-30d5-42dd-8a6a-6be9f2f99fb4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4c7e0fdc-ed90-4d12-8a7a-7de87ca13fe5" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_faf51755-af98-4df3-9a7e-b6177a2f436e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4c7e0fdc-ed90-4d12-8a7a-7de87ca13fe5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_84d5ef5f-f220-41a7-9246-ecb96203cad1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_4c7e0fdc-ed90-4d12-8a7a-7de87ca13fe5" xlink:to="loc_us-gaap_AwardTypeAxis_84d5ef5f-f220-41a7-9246-ecb96203cad1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_84d5ef5f-f220-41a7-9246-ecb96203cad1_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_84d5ef5f-f220-41a7-9246-ecb96203cad1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_84d5ef5f-f220-41a7-9246-ecb96203cad1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_722403f9-0290-4a00-b209-1d2267fae31c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_84d5ef5f-f220-41a7-9246-ecb96203cad1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_722403f9-0290-4a00-b209-1d2267fae31c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_RSUAndPSUMember_4753cb84-e058-4275-a485-3ca0de2fd45c" xlink:href="crwd-20201031.xsd#crwd_RSUAndPSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_722403f9-0290-4a00-b209-1d2267fae31c" xlink:to="loc_crwd_RSUAndPSUMember_4753cb84-e058-4275-a485-3ca0de2fd45c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/StockBasedCompensationExpenseDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#StockBasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/StockBasedCompensationExpenseDetails" xlink:type="extended" id="ie4f5bf1035c04325904ba3e0fa59e0c8_StockBasedCompensationExpenseDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_d52302ee-9063-44d8-bc43-c8b09d616839" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_4a44b369-5ec5-48fc-90d0-334e0804f3f8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_d52302ee-9063-44d8-bc43-c8b09d616839" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_4a44b369-5ec5-48fc-90d0-334e0804f3f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_8801dd68-bf1a-4cc8-9208-1cb1c4f0443a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_d52302ee-9063-44d8-bc43-c8b09d616839" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_8801dd68-bf1a-4cc8-9208-1cb1c4f0443a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_8bf80398-a21f-4f34-80d5-adcc6d70e3be" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_8801dd68-bf1a-4cc8-9208-1cb1c4f0443a" xlink:to="loc_srt_ProductOrServiceAxis_8bf80398-a21f-4f34-80d5-adcc6d70e3be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_8bf80398-a21f-4f34-80d5-adcc6d70e3be_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_8bf80398-a21f-4f34-80d5-adcc6d70e3be" xlink:to="loc_srt_ProductsAndServicesDomain_8bf80398-a21f-4f34-80d5-adcc6d70e3be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_10f7b237-638d-447d-959e-17eab598ff07" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_8bf80398-a21f-4f34-80d5-adcc6d70e3be" xlink:to="loc_srt_ProductsAndServicesDomain_10f7b237-638d-447d-959e-17eab598ff07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubscriptionAndCirculationMember_86fc8d42-cc54-4fab-9b4d-9abc9165101e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubscriptionAndCirculationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_10f7b237-638d-447d-959e-17eab598ff07" xlink:to="loc_us-gaap_SubscriptionAndCirculationMember_86fc8d42-cc54-4fab-9b4d-9abc9165101e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ProfessionalServicesMember_05c913ed-f741-44e0-802c-b5a042bd28ea" xlink:href="crwd-20201031.xsd#crwd_ProfessionalServicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_10f7b237-638d-447d-959e-17eab598ff07" xlink:to="loc_crwd_ProfessionalServicesMember_05c913ed-f741-44e0-802c-b5a042bd28ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_c6e4777a-76a8-41f7-bf45-3141af88359f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_8801dd68-bf1a-4cc8-9208-1cb1c4f0443a" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_c6e4777a-76a8-41f7-bf45-3141af88359f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_c6e4777a-76a8-41f7-bf45-3141af88359f_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_c6e4777a-76a8-41f7-bf45-3141af88359f" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_c6e4777a-76a8-41f7-bf45-3141af88359f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_46d24c04-d139-48d1-b110-b694f27dae26" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_c6e4777a-76a8-41f7-bf45-3141af88359f" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_46d24c04-d139-48d1-b110-b694f27dae26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_56a9e576-d52f-4c96-aaf7-384de7078696" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_46d24c04-d139-48d1-b110-b694f27dae26" xlink:to="loc_us-gaap_CostOfSalesMember_56a9e576-d52f-4c96-aaf7-384de7078696" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_1a89fd28-2b9b-4647-b08e-c854baf59745" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_46d24c04-d139-48d1-b110-b694f27dae26" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_1a89fd28-2b9b-4647-b08e-c854baf59745" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_b7f7a878-04ca-4c46-a6a6-6640c9988683" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_46d24c04-d139-48d1-b110-b694f27dae26" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_b7f7a878-04ca-4c46-a6a6-6640c9988683" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_378c409d-5b16-4f41-bc9d-91afb63e464b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_46d24c04-d139-48d1-b110-b694f27dae26" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_378c409d-5b16-4f41-bc9d-91afb63e464b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligations" xlink:type="simple" xlink:href="crwd-20201031.xsd#RevenueDeferredRevenueandRemainingPerformanceObligations"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligations" xlink:type="extended" id="i150fb9cdbd5c4606a94fb94be7779ec7_RevenueDeferredRevenueandRemainingPerformanceObligations"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsTables" xlink:type="simple" xlink:href="crwd-20201031.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsTables" xlink:type="extended" id="i1ee821c5df1c47a58ee3a7b93491f0ce_RevenueDeferredRevenueandRemainingPerformanceObligationsTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsRevenuefromContractsbyTypeandRegionDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsRevenuefromContractsbyTypeandRegionDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsRevenuefromContractsbyTypeandRegionDetails" xlink:type="extended" id="ic3d41b3d29704834bf4c2ae45d96834f_RevenueDeferredRevenueandRemainingPerformanceObligationsRevenuefromContractsbyTypeandRegionDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_be6f6f44-a0bd-49d0-ac73-a2268b6ae32a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_8bea1d83-a98c-4c0c-bb1c-4d39e8c6f42f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_be6f6f44-a0bd-49d0-ac73-a2268b6ae32a" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax_8bea1d83-a98c-4c0c-bb1c-4d39e8c6f42f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PercentageOfRevenue_a964d3e3-abe9-432a-a82a-dbb3ca6d6dd5" xlink:href="crwd-20201031.xsd#crwd_PercentageOfRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_be6f6f44-a0bd-49d0-ac73-a2268b6ae32a" xlink:to="loc_crwd_PercentageOfRevenue_a964d3e3-abe9-432a-a82a-dbb3ca6d6dd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_be85d4b3-fdbd-4320-ad83-7f8930ec868d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_be6f6f44-a0bd-49d0-ac73-a2268b6ae32a" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_be85d4b3-fdbd-4320-ad83-7f8930ec868d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelAxis_6aa2346a-552a-4a3e-8b9d-d48e8e007b86" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_be85d4b3-fdbd-4320-ad83-7f8930ec868d" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelAxis_6aa2346a-552a-4a3e-8b9d-d48e8e007b86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_6aa2346a-552a-4a3e-8b9d-d48e8e007b86_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_6aa2346a-552a-4a3e-8b9d-d48e8e007b86" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_6aa2346a-552a-4a3e-8b9d-d48e8e007b86_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerSalesChannelDomain_dbabdb6a-9ac3-4bc6-8fbd-e0671e920710" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerSalesChannelDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelAxis_6aa2346a-552a-4a3e-8b9d-d48e8e007b86" xlink:to="loc_us-gaap_ContractWithCustomerSalesChannelDomain_dbabdb6a-9ac3-4bc6-8fbd-e0671e920710" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesChannelThroughIntermediaryMember_8e0b5b68-b1a9-48b6-850b-b25c4a45cdd1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SalesChannelThroughIntermediaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelDomain_dbabdb6a-9ac3-4bc6-8fbd-e0671e920710" xlink:to="loc_us-gaap_SalesChannelThroughIntermediaryMember_8e0b5b68-b1a9-48b6-850b-b25c4a45cdd1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesChannelDirectlyToConsumerMember_fa6f049b-acb1-4d54-a7f2-cece2ddbd75f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SalesChannelDirectlyToConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerSalesChannelDomain_dbabdb6a-9ac3-4bc6-8fbd-e0671e920710" xlink:to="loc_us-gaap_SalesChannelDirectlyToConsumerMember_fa6f049b-acb1-4d54-a7f2-cece2ddbd75f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_dcc22b42-08ce-4811-ad29-9325e218d5a6" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_be85d4b3-fdbd-4320-ad83-7f8930ec868d" xlink:to="loc_srt_StatementGeographicalAxis_dcc22b42-08ce-4811-ad29-9325e218d5a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_dcc22b42-08ce-4811-ad29-9325e218d5a6_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_dcc22b42-08ce-4811-ad29-9325e218d5a6" xlink:to="loc_srt_SegmentGeographicalDomain_dcc22b42-08ce-4811-ad29-9325e218d5a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_36791b79-b79b-457a-8fab-18ac24f77194" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_dcc22b42-08ce-4811-ad29-9325e218d5a6" xlink:to="loc_srt_SegmentGeographicalDomain_36791b79-b79b-457a-8fab-18ac24f77194" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_3005f22a-08e6-4753-b625-66d94b1cf1da" xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_36791b79-b79b-457a-8fab-18ac24f77194" xlink:to="loc_country_US_3005f22a-08e6-4753-b625-66d94b1cf1da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_d5878671-1e8a-40ff-b6c2-87af75d6afaa" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_36791b79-b79b-457a-8fab-18ac24f77194" xlink:to="loc_us-gaap_EMEAMember_d5878671-1e8a-40ff-b6c2-87af75d6afaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_d8dd1f48-7e6e-4c0a-ba7a-fd8ab03d2b13" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_36791b79-b79b-457a-8fab-18ac24f77194" xlink:to="loc_srt_AsiaPacificMember_d8dd1f48-7e6e-4c0a-ba7a-fd8ab03d2b13" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_OtherCountriesMember_ab439b37-6b95-46dd-92bf-bc953fda7086" xlink:href="crwd-20201031.xsd#crwd_OtherCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_36791b79-b79b-457a-8fab-18ac24f77194" xlink:to="loc_crwd_OtherCountriesMember_ab439b37-6b95-46dd-92bf-bc953fda7086" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsAdditionalInformationDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsAdditionalInformationDetails" xlink:type="extended" id="i4a9365e635614f60b023e387564b5094_RevenueDeferredRevenueandRemainingPerformanceObligationsAdditionalInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ContractWithCustomerLiabilityLineItems_d4cc9463-0b01-46bb-b7a8-84637052a7f1" xlink:href="crwd-20201031.xsd#crwd_ContractWithCustomerLiabilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_d383db93-5d23-4fac-a592-cdd9f543cb83" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ContractWithCustomerLiabilityRevenueRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_d4cc9463-0b01-46bb-b7a8-84637052a7f1" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityRevenueRecognized_d383db93-5d23-4fac-a592-cdd9f543cb83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_RevenueContractLiabilitiesPaymentTerms_7212ad53-a1e7-4776-87d3-66fd367b76b5" xlink:href="crwd-20201031.xsd#crwd_RevenueContractLiabilitiesPaymentTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_d4cc9463-0b01-46bb-b7a8-84637052a7f1" xlink:to="loc_crwd_RevenueContractLiabilitiesPaymentTerms_7212ad53-a1e7-4776-87d3-66fd367b76b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_SubscriptionTerm_d7641731-5466-484c-91b1-b39306a6e901" xlink:href="crwd-20201031.xsd#crwd_SubscriptionTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_d4cc9463-0b01-46bb-b7a8-84637052a7f1" xlink:to="loc_crwd_SubscriptionTerm_d7641731-5466-484c-91b1-b39306a6e901" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_RevenueAmortizationOverEstimatedBenefitForCommissionIncludingReferralFeesPaid_5371bca0-b0a2-4162-ad54-199f9b84c031" xlink:href="crwd-20201031.xsd#crwd_RevenueAmortizationOverEstimatedBenefitForCommissionIncludingReferralFeesPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_d4cc9463-0b01-46bb-b7a8-84637052a7f1" xlink:to="loc_crwd_RevenueAmortizationOverEstimatedBenefitForCommissionIncludingReferralFeesPaid_5371bca0-b0a2-4162-ad54-199f9b84c031" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_RevenueAmortizationOverEstimatedBenefitForSalesCommission_38b47dff-c4a1-4476-b61f-11492771a8e9" xlink:href="crwd-20201031.xsd#crwd_RevenueAmortizationOverEstimatedBenefitForSalesCommission"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_d4cc9463-0b01-46bb-b7a8-84637052a7f1" xlink:to="loc_crwd_RevenueAmortizationOverEstimatedBenefitForSalesCommission_38b47dff-c4a1-4476-b61f-11492771a8e9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostImpairmentLoss_38e9a78a-df36-491b-8c99-6f8419d84100" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_d4cc9463-0b01-46bb-b7a8-84637052a7f1" xlink:to="loc_us-gaap_CapitalizedContractCostImpairmentLoss_38e9a78a-df36-491b-8c99-6f8419d84100" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_ContractWithCustomerLiabilityTable_ce005bc2-2f3e-44dd-9c1a-9ba17b672f13" xlink:href="crwd-20201031.xsd#crwd_ContractWithCustomerLiabilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_crwd_ContractWithCustomerLiabilityLineItems_d4cc9463-0b01-46bb-b7a8-84637052a7f1" xlink:to="loc_crwd_ContractWithCustomerLiabilityTable_ce005bc2-2f3e-44dd-9c1a-9ba17b672f13" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_d1bad408-bee2-4796-ae20-5a33352a918e" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_crwd_ContractWithCustomerLiabilityTable_ce005bc2-2f3e-44dd-9c1a-9ba17b672f13" xlink:to="loc_srt_RangeAxis_d1bad408-bee2-4796-ae20-5a33352a918e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d1bad408-bee2-4796-ae20-5a33352a918e_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_d1bad408-bee2-4796-ae20-5a33352a918e" xlink:to="loc_srt_RangeMember_d1bad408-bee2-4796-ae20-5a33352a918e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_afb13a46-c624-478a-9cbd-dbc2d983fc50" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_d1bad408-bee2-4796-ae20-5a33352a918e" xlink:to="loc_srt_RangeMember_afb13a46-c624-478a-9cbd-dbc2d983fc50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_32bc47f7-11b5-4b66-ae66-0572dda64c9b" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_afb13a46-c624-478a-9cbd-dbc2d983fc50" xlink:to="loc_srt_MinimumMember_32bc47f7-11b5-4b66-ae66-0572dda64c9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_328deb83-72d3-4c4d-936f-96a7ea16548f" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_afb13a46-c624-478a-9cbd-dbc2d983fc50" xlink:to="loc_srt_MaximumMember_328deb83-72d3-4c4d-936f-96a7ea16548f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsChangesinDeferredRevenueDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsChangesinDeferredRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsChangesinDeferredRevenueDetails" xlink:type="extended" id="iafc67f3ffbba409cafa8287b6ddf7e7d_RevenueDeferredRevenueandRemainingPerformanceObligationsChangesinDeferredRevenueDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails" xlink:type="extended" id="if430cdcc99ca4adeb57bebc2d15d7270_RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_82c55987-fa9a-4183-9837-dacb7ae8e84b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_81341ab0-05a7-400e-8ab7-07b2738f26b7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_82c55987-fa9a-4183-9837-dacb7ae8e84b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_81341ab0-05a7-400e-8ab7-07b2738f26b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_84f0eed5-b0dc-421c-84b3-6ece1ae0000a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_82c55987-fa9a-4183-9837-dacb7ae8e84b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_84f0eed5-b0dc-421c-84b3-6ece1ae0000a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_39ea3eaa-dc48-4820-8e14-f7d2d51099eb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_82c55987-fa9a-4183-9837-dacb7ae8e84b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_39ea3eaa-dc48-4820-8e14-f7d2d51099eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_02602494-7cf9-4e21-ac92-52e365c03ff1" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_39ea3eaa-dc48-4820-8e14-f7d2d51099eb" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis_02602494-7cf9-4e21-ac92-52e365c03ff1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails_1" xlink:type="simple" xlink:href="crwd-20201031.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails_1"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails_1" xlink:type="extended" id="i6914c9d763064e7bb39f2b6aaf2557c7_RevenueDeferredRevenueandRemainingPerformanceObligationsPerformanceObligationsDetails_1">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_82c55987-fa9a-4183-9837-dacb7ae8e84b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_81341ab0-05a7-400e-8ab7-07b2738f26b7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_82c55987-fa9a-4183-9837-dacb7ae8e84b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationPercentage_81341ab0-05a7-400e-8ab7-07b2738f26b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_84f0eed5-b0dc-421c-84b3-6ece1ae0000a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_82c55987-fa9a-4183-9837-dacb7ae8e84b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1_84f0eed5-b0dc-421c-84b3-6ece1ae0000a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_39ea3eaa-dc48-4820-8e14-f7d2d51099eb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems_82c55987-fa9a-4183-9837-dacb7ae8e84b" xlink:to="loc_us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable_39ea3eaa-dc48-4820-8e14-f7d2d51099eb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsDeferredcontractacquisitioncostsDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#RevenueDeferredRevenueandRemainingPerformanceObligationsDeferredcontractacquisitioncostsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RevenueDeferredRevenueandRemainingPerformanceObligationsDeferredcontractacquisitioncostsDetails" xlink:type="extended" id="iea79efc1d90d4909a686613169a35ec6_RevenueDeferredRevenueandRemainingPerformanceObligationsDeferredcontractacquisitioncostsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_59cf7cbe-326c-4b64-a9dc-dd05ccbb112e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_MovementInDeferredContractAcquisitionCostsRollForward_4d1e4797-3609-4159-b20d-47d7cdb21457" xlink:href="crwd-20201031.xsd#crwd_MovementInDeferredContractAcquisitionCostsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_59cf7cbe-326c-4b64-a9dc-dd05ccbb112e" xlink:to="loc_crwd_MovementInDeferredContractAcquisitionCostsRollForward_4d1e4797-3609-4159-b20d-47d7cdb21457" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNet_098b5554-53e2-4245-856e-2c0b4d8206a8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_MovementInDeferredContractAcquisitionCostsRollForward_4d1e4797-3609-4159-b20d-47d7cdb21457" xlink:to="loc_us-gaap_CapitalizedContractCostNet_098b5554-53e2-4245-856e-2c0b4d8206a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNet_c32f3cf2-ca90-4610-b4b4-ae588d9f8808" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CapitalizedContractCostAmountCapitalized_893510a2-efb6-4929-be1d-a1ccd3fe3099" xlink:href="crwd-20201031.xsd#crwd_CapitalizedContractCostAmountCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_MovementInDeferredContractAcquisitionCostsRollForward_4d1e4797-3609-4159-b20d-47d7cdb21457" xlink:to="loc_crwd_CapitalizedContractCostAmountCapitalized_893510a2-efb6-4929-be1d-a1ccd3fe3099" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_be2dad6f-3032-4f1f-bde9-337096e67249" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_MovementInDeferredContractAcquisitionCostsRollForward_4d1e4797-3609-4159-b20d-47d7cdb21457" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_be2dad6f-3032-4f1f-bde9-337096e67249" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNet_3a3d1300-d7e9-4eaf-a891-8694ed575b73" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetCurrent_39b63f61-c881-4259-9c20-9a114668f882" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_MovementInDeferredContractAcquisitionCostsRollForward_4d1e4797-3609-4159-b20d-47d7cdb21457" xlink:to="loc_us-gaap_CapitalizedContractCostNetCurrent_39b63f61-c881-4259-9c20-9a114668f882" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNetNoncurrent_aef43147-7f31-4c7c-aee3-7d8cb7707e65" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostNetNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_MovementInDeferredContractAcquisitionCostsRollForward_4d1e4797-3609-4159-b20d-47d7cdb21457" xlink:to="loc_us-gaap_CapitalizedContractCostNetNoncurrent_aef43147-7f31-4c7c-aee3-7d8cb7707e65" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNet_9d3eb6a2-31f2-4e24-b51f-ee5689bbee88" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CapitalizedContractCostNet"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_57f90c02-4afb-4445-9996-7332f9703b22" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_59cf7cbe-326c-4b64-a9dc-dd05ccbb112e" xlink:to="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_57f90c02-4afb-4445-9996-7332f9703b22" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_3f068192-6472-48ef-aa61-eec2d2f1fa3b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_57f90c02-4afb-4445-9996-7332f9703b22" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_3f068192-6472-48ef-aa61-eec2d2f1fa3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_3f068192-6472-48ef-aa61-eec2d2f1fa3b_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_3f068192-6472-48ef-aa61-eec2d2f1fa3b" xlink:to="loc_us-gaap_TypeOfAdoptionMember_3f068192-6472-48ef-aa61-eec2d2f1fa3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_71f32dd3-08c4-481f-8d4c-ddb6dfa36a21" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_3f068192-6472-48ef-aa61-eec2d2f1fa3b" xlink:to="loc_us-gaap_TypeOfAdoptionMember_71f32dd3-08c4-481f-8d4c-ddb6dfa36a21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate201409Member_8e67d4b9-8930-46d3-be3e-093683f58492" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AccountingStandardsUpdate201409Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_71f32dd3-08c4-481f-8d4c-ddb6dfa36a21" xlink:to="loc_us-gaap_AccountingStandardsUpdate201409Member_8e67d4b9-8930-46d3-be3e-093683f58492" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_125e8540-00df-4add-a32f-ea4076b07a4f" xlink:href="crwd-20201031.xsd#crwd_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_57f90c02-4afb-4445-9996-7332f9703b22" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_125e8540-00df-4add-a32f-ea4076b07a4f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_125e8540-00df-4add-a32f-ea4076b07a4f_default" xlink:href="crwd-20201031.xsd#crwd_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_125e8540-00df-4add-a32f-ea4076b07a4f" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_125e8540-00df-4add-a32f-ea4076b07a4f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_50303d40-5aa7-4794-bcd7-e963aeea109b" xlink:href="crwd-20201031.xsd#crwd_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionAxis_125e8540-00df-4add-a32f-ea4076b07a4f" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_50303d40-5aa7-4794-bcd7-e963aeea109b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember_5950fa27-fa6b-49b5-b845-397cd876fb77" xlink:href="crwd-20201031.xsd#crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_crwd_CumulativeEffectPeriodOfAdoptionDomain_50303d40-5aa7-4794-bcd7-e963aeea109b" xlink:to="loc_crwd_CumulativeEffectPeriodOfAdoptionAdjustmentMember_5950fa27-fa6b-49b5-b845-397cd876fb77" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CommitmentsandContingencies" xlink:type="simple" xlink:href="crwd-20201031.xsd#CommitmentsandContingencies"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CommitmentsandContingencies" xlink:type="extended" id="i30b3d76d19cc4b24a7e8ef0eaf5c63f9_CommitmentsandContingencies"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CommitmentsandContingenciesTables" xlink:type="simple" xlink:href="crwd-20201031.xsd#CommitmentsandContingenciesTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CommitmentsandContingenciesTables" xlink:type="extended" id="if2e48c6b8b3645498c63367523963db6_CommitmentsandContingenciesTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#CommitmentsandContingenciesDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CommitmentsandContingenciesDetails" xlink:type="extended" id="i24794fc8271b4f7493054f3593108285_CommitmentsandContingenciesDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_a48c1f61-4384-4a38-894a-5fc0beb9f750" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RecordedUnconditionalPurchaseObligationAmountOfMaturitiesAndSinkingFundRequirements_312f405f-7145-4012-8645-e3722d1c2ccf" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RecordedUnconditionalPurchaseObligationAmountOfMaturitiesAndSinkingFundRequirements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a48c1f61-4384-4a38-894a-5fc0beb9f750" xlink:to="loc_us-gaap_RecordedUnconditionalPurchaseObligationAmountOfMaturitiesAndSinkingFundRequirements_312f405f-7145-4012-8645-e3722d1c2ccf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_403058d6-e7ec-4c95-82e8-4a5129d00818" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a48c1f61-4384-4a38-894a-5fc0beb9f750" xlink:to="loc_us-gaap_LineOfCredit_403058d6-e7ec-4c95-82e8-4a5129d00818" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_fc489cc9-685f-4938-b6ad-6d1ed3e8bd12" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LossContingencyAccrualAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a48c1f61-4384-4a38-894a-5fc0beb9f750" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_fc489cc9-685f-4938-b6ad-6d1ed3e8bd12" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductWarrantyAccrual_2fa1f445-eded-4e83-9e42-62d20c1d9335" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ProductWarrantyAccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a48c1f61-4384-4a38-894a-5fc0beb9f750" xlink:to="loc_us-gaap_ProductWarrantyAccrual_2fa1f445-eded-4e83-9e42-62d20c1d9335" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_08d3639a-6a45-4dbb-a338-9efd4445ce8c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_a48c1f61-4384-4a38-894a-5fc0beb9f750" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_08d3639a-6a45-4dbb-a338-9efd4445ce8c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_2e1b3a22-0397-418d-b38a-dcb375ddbfec" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_08d3639a-6a45-4dbb-a338-9efd4445ce8c" xlink:to="loc_srt_StatementGeographicalAxis_2e1b3a22-0397-418d-b38a-dcb375ddbfec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_2e1b3a22-0397-418d-b38a-dcb375ddbfec_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_2e1b3a22-0397-418d-b38a-dcb375ddbfec" xlink:to="loc_srt_SegmentGeographicalDomain_2e1b3a22-0397-418d-b38a-dcb375ddbfec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_5678eaf4-0c9e-4b2e-a1bb-8dc75be7b738" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_2e1b3a22-0397-418d-b38a-dcb375ddbfec" xlink:to="loc_srt_SegmentGeographicalDomain_5678eaf4-0c9e-4b2e-a1bb-8dc75be7b738" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_CA_cecefde9-507d-4c34-9a50-6744cce95324" xlink:href="https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd#stpr_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5678eaf4-0c9e-4b2e-a1bb-8dc75be7b738" xlink:to="loc_stpr_CA_cecefde9-507d-4c34-9a50-6744cce95324" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_TX_d37fe5e3-ccf2-40d9-aeb5-1a7546d8d370" xlink:href="https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd#stpr_TX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_5678eaf4-0c9e-4b2e-a1bb-8dc75be7b738" xlink:to="loc_stpr_TX_d37fe5e3-ccf2-40d9-aeb5-1a7546d8d370" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_ce24c249-c103-4dfc-8a00-0ea08e4d541d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_08d3639a-6a45-4dbb-a338-9efd4445ce8c" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_ce24c249-c103-4dfc-8a00-0ea08e4d541d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_ce24c249-c103-4dfc-8a00-0ea08e4d541d_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_ce24c249-c103-4dfc-8a00-0ea08e4d541d" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_ce24c249-c103-4dfc-8a00-0ea08e4d541d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_09c2adae-c80a-4d92-ad71-4ddcfba3854d" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_ce24c249-c103-4dfc-8a00-0ea08e4d541d" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_09c2adae-c80a-4d92-ad71-4ddcfba3854d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_3e0c7b4a-4cd5-46b1-98d3-3f0577937387" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_09c2adae-c80a-4d92-ad71-4ddcfba3854d" xlink:to="loc_us-gaap_SubsequentEventMember_3e0c7b4a-4cd5-46b1-98d3-3f0577937387" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/CommitmentsandContingenciesPurchaseObligationsDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#CommitmentsandContingenciesPurchaseObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/CommitmentsandContingenciesPurchaseObligationsDetails" xlink:type="extended" id="i3af232f2e80e49a7b74478c309076005_CommitmentsandContingenciesPurchaseObligationsDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/GeographicInformation" xlink:type="simple" xlink:href="crwd-20201031.xsd#GeographicInformation"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/GeographicInformation" xlink:type="extended" id="i78d5e32a27224bd9aae92abc657cdb01_GeographicInformation"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/GeographicInformationTables" xlink:type="simple" xlink:href="crwd-20201031.xsd#GeographicInformationTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/GeographicInformationTables" xlink:type="extended" id="i9db8fcfc124a4f81bb33797f7f4c9635_GeographicInformationTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/GeographicInformationDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#GeographicInformationDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/GeographicInformationDetails" xlink:type="extended" id="i9ed47827e7b74cf4ae7d1f16f6712989_GeographicInformationDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_787a6a01-73a1-4605-9b5e-3c627637b433" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PropertyPlantAndEquipmentNetAndOperatingLeaseRightOfUseAssets_09c251b7-3473-47be-bcf4-c0024e0eb7f4" xlink:href="crwd-20201031.xsd#crwd_PropertyPlantAndEquipmentNetAndOperatingLeaseRightOfUseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_787a6a01-73a1-4605-9b5e-3c627637b433" xlink:to="loc_crwd_PropertyPlantAndEquipmentNetAndOperatingLeaseRightOfUseAssets_09c251b7-3473-47be-bcf4-c0024e0eb7f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_7911a59a-eabb-4822-bcc0-d6517f8dcf68" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_787a6a01-73a1-4605-9b5e-3c627637b433" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_7911a59a-eabb-4822-bcc0-d6517f8dcf68" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_5e9b4a05-6939-4f96-a674-a1d388f1dfb5" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_7911a59a-eabb-4822-bcc0-d6517f8dcf68" xlink:to="loc_srt_StatementGeographicalAxis_5e9b4a05-6939-4f96-a674-a1d388f1dfb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_5e9b4a05-6939-4f96-a674-a1d388f1dfb5_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_5e9b4a05-6939-4f96-a674-a1d388f1dfb5" xlink:to="loc_srt_SegmentGeographicalDomain_5e9b4a05-6939-4f96-a674-a1d388f1dfb5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_c046af73-9811-4583-bf17-904dc357d467" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_5e9b4a05-6939-4f96-a674-a1d388f1dfb5" xlink:to="loc_srt_SegmentGeographicalDomain_c046af73-9811-4583-bf17-904dc357d467" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_dbcc660a-32bc-4488-819f-5cadfc10ce5d" xlink:href="https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c046af73-9811-4583-bf17-904dc357d467" xlink:to="loc_country_US_dbcc660a-32bc-4488-819f-5cadfc10ce5d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_23b7a6da-ae83-4561-8961-dfba62db86ed" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_c046af73-9811-4583-bf17-904dc357d467" xlink:to="loc_us-gaap_NonUsMember_23b7a6da-ae83-4561-8961-dfba62db86ed" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RelatedPartyTransactions" xlink:type="simple" xlink:href="crwd-20201031.xsd#RelatedPartyTransactions"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RelatedPartyTransactions" xlink:type="extended" id="i0f3a05cbfc4849c9a773f38aa94d0250_RelatedPartyTransactions"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/RelatedPartyTransactionsDetails" xlink:type="extended" id="i7f3f91fae1e04750ab5bc1f3f88a7b18_RelatedPartyTransactionsDetails"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/Acquisitions" xlink:type="simple" xlink:href="crwd-20201031.xsd#Acquisitions"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/Acquisitions" xlink:type="extended" id="ib0ccaf91d8354b63817d30a5e9a3b86d_Acquisitions"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/AcquisitionsTables" xlink:type="simple" xlink:href="crwd-20201031.xsd#AcquisitionsTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/AcquisitionsTables" xlink:type="extended" id="i07d3d4dc53054620b40bae0902655878_AcquisitionsTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/AcquisitionsDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#AcquisitionsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/AcquisitionsDetails" xlink:type="extended" id="i55374b482d4f4cd6b7900abaffb34b1d_AcquisitionsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_7a000a2c-34d7-47c6-aa5e-a2c4a14c4349" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_4f217b55-b614-4a57-9681-34bb078f1cf9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a000a2c-34d7-47c6-aa5e-a2c4a14c4349" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_4f217b55-b614-4a57-9681-34bb078f1cf9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_bd300efc-dc15-4d7c-b2bd-785c162bbc1e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a000a2c-34d7-47c6-aa5e-a2c4a14c4349" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_bd300efc-dc15-4d7c-b2bd-785c162bbc1e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_d0340d03-c86b-4499-b55b-4732b4a6a4a8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a000a2c-34d7-47c6-aa5e-a2c4a14c4349" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_d0340d03-c86b-4499-b55b-4732b4a6a4a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_e96b56c5-9c2f-4d94-a300-20a753a5548a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a000a2c-34d7-47c6-aa5e-a2c4a14c4349" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_e96b56c5-9c2f-4d94-a300-20a753a5548a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_088121e0-2b66-4958-b4f4-8732857e30bf" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a000a2c-34d7-47c6-aa5e-a2c4a14c4349" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_088121e0-2b66-4958-b4f4-8732857e30bf" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_2f4848c1-cca6-46a9-ae19-04b25caa899e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a000a2c-34d7-47c6-aa5e-a2c4a14c4349" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_2f4848c1-cca6-46a9-ae19-04b25caa899e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_0a7cfc53-ceff-4518-89ac-1a275559e3a2" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a000a2c-34d7-47c6-aa5e-a2c4a14c4349" xlink:to="loc_us-gaap_Goodwill_0a7cfc53-ceff-4518-89ac-1a275559e3a2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_849e5925-6e2b-4cc6-b278-b3448b25af6b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a000a2c-34d7-47c6-aa5e-a2c4a14c4349" xlink:to="loc_us-gaap_NumberOfReportableSegments_849e5925-6e2b-4cc6-b278-b3448b25af6b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_a4c1936f-5f47-4a73-bfea-f1d5c3b4ab31" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_7a000a2c-34d7-47c6-aa5e-a2c4a14c4349" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_a4c1936f-5f47-4a73-bfea-f1d5c3b4ab31" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_c70e785b-5f37-4d8c-8706-29a90c643d51" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_a4c1936f-5f47-4a73-bfea-f1d5c3b4ab31" xlink:to="loc_srt_RangeAxis_c70e785b-5f37-4d8c-8706-29a90c643d51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c70e785b-5f37-4d8c-8706-29a90c643d51_default" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_c70e785b-5f37-4d8c-8706-29a90c643d51" xlink:to="loc_srt_RangeMember_c70e785b-5f37-4d8c-8706-29a90c643d51_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_10a48bbb-080c-4374-b2c3-75aad8f874a5" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_c70e785b-5f37-4d8c-8706-29a90c643d51" xlink:to="loc_srt_RangeMember_10a48bbb-080c-4374-b2c3-75aad8f874a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_9369bda2-c8be-4e44-a1f9-3abade9cde37" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_10a48bbb-080c-4374-b2c3-75aad8f874a5" xlink:to="loc_srt_MinimumMember_9369bda2-c8be-4e44-a1f9-3abade9cde37" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_a77d9243-034c-49fc-a606-6d1d491ca316" xlink:href="http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_10a48bbb-080c-4374-b2c3-75aad8f874a5" xlink:to="loc_srt_MaximumMember_a77d9243-034c-49fc-a606-6d1d491ca316" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_5d31d8d1-4686-4940-973a-1823b237d12a" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_a4c1936f-5f47-4a73-bfea-f1d5c3b4ab31" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_5d31d8d1-4686-4940-973a-1823b237d12a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5d31d8d1-4686-4940-973a-1823b237d12a_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5d31d8d1-4686-4940-973a-1823b237d12a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_5d31d8d1-4686-4940-973a-1823b237d12a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7950ff23-7599-4df5-9bda-b8e96e0b02a9" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5d31d8d1-4686-4940-973a-1823b237d12a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7950ff23-7599-4df5-9bda-b8e96e0b02a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_PreemptSecurityIncMember_ca4aa712-b4f3-40d8-b9ee-d1dfdd683bcc" xlink:href="crwd-20201031.xsd#crwd_PreemptSecurityIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7950ff23-7599-4df5-9bda-b8e96e0b02a9" xlink:to="loc_crwd_PreemptSecurityIncMember_ca4aa712-b4f3-40d8-b9ee-d1dfdd683bcc" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/AcquisitionsIdentifiableIntangibleAssetsDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#AcquisitionsIdentifiableIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/AcquisitionsIdentifiableIntangibleAssetsDetails" xlink:type="extended" id="i0ba9c01d800841f59541c0f4e662dc6b_AcquisitionsIdentifiableIntangibleAssetsDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_bd6065be-04b2-4d68-9327-efe5b17dcc84" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_118a508c-a385-4bc6-9696-74c034a489bb" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_bd6065be-04b2-4d68-9327-efe5b17dcc84" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_118a508c-a385-4bc6-9696-74c034a489bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_e3746c51-04d8-421e-90e0-9afa3c5dec6b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_bd6065be-04b2-4d68-9327-efe5b17dcc84" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_e3746c51-04d8-421e-90e0-9afa3c5dec6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_3a6b2b6e-6552-47a7-9ab2-d69a347d0037" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_bd6065be-04b2-4d68-9327-efe5b17dcc84" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_3a6b2b6e-6552-47a7-9ab2-d69a347d0037" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_2ed717db-87e4-4d99-a8cc-cd4f8ddb2e53" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems_bd6065be-04b2-4d68-9327-efe5b17dcc84" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_2ed717db-87e4-4d99-a8cc-cd4f8ddb2e53" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_29751565-cd78-4243-bff2-043a887f1405" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsAcquiredAsPartOfBusinessCombinationTable_2ed717db-87e4-4d99-a8cc-cd4f8ddb2e53" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_29751565-cd78-4243-bff2-043a887f1405" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_29751565-cd78-4243-bff2-043a887f1405_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_29751565-cd78-4243-bff2-043a887f1405" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_29751565-cd78-4243-bff2-043a887f1405_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_82838af4-fc71-4893-91cd-30203e99941b" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_29751565-cd78-4243-bff2-043a887f1405" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_82838af4-fc71-4893-91cd-30203e99941b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_e3b6c578-a5eb-464e-a1a5-52c3d2bd2fcd" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_82838af4-fc71-4893-91cd-30203e99941b" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_e3b6c578-a5eb-464e-a1a5-52c3d2bd2fcd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_72ec5d06-81fc-47dc-b175-b1948a9b2925" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_82838af4-fc71-4893-91cd-30203e99941b" xlink:to="loc_us-gaap_CustomerRelationshipsMember_72ec5d06-81fc-47dc-b175-b1948a9b2925" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_9b667a53-d18a-4974-8d90-d5a6aac5d33e" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_82838af4-fc71-4893-91cd-30203e99941b" xlink:to="loc_us-gaap_TradeNamesMember_9b667a53-d18a-4974-8d90-d5a6aac5d33e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholders" xlink:type="simple" xlink:href="crwd-20201031.xsd#NetLossPerShareAttributabletoCommonStockholders"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholders" xlink:type="extended" id="ied4f4af6b94b4003b65e692e1c2e5a8c_NetLossPerShareAttributabletoCommonStockholders"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholdersTables" xlink:type="simple" xlink:href="crwd-20201031.xsd#NetLossPerShareAttributabletoCommonStockholdersTables"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholdersTables" xlink:type="extended" id="i555bdbaedc0e4ca9a174e896ea5b23d9_NetLossPerShareAttributabletoCommonStockholdersTables"/>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholdersDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#NetLossPerShareAttributabletoCommonStockholdersDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholdersDetails" xlink:type="extended" id="iddc82ca8f2cb423ca2074cd20b1e1441_NetLossPerShareAttributabletoCommonStockholdersDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_02b0102a-5730-47be-ab68-d7e143ec4af8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_87f76297-32c7-401a-b509-265b09095ca8" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_02b0102a-5730-47be-ab68-d7e143ec4af8" xlink:to="loc_us-gaap_NetIncomeLoss_87f76297-32c7-401a-b509-265b09095ca8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_bad41f8a-88a5-4f09-9680-6b59d1663c29" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_02b0102a-5730-47be-ab68-d7e143ec4af8" xlink:to="loc_us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted_bad41f8a-88a5-4f09-9680-6b59d1663c29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAndDiluted_0474a75e-8e4c-42ca-b1ff-163c2784e5de" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EarningsPerShareBasicAndDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_02b0102a-5730-47be-ab68-d7e143ec4af8" xlink:to="loc_us-gaap_EarningsPerShareBasicAndDiluted_0474a75e-8e4c-42ca-b1ff-163c2784e5de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_d21a3fd5-d644-4ccf-9c1a-1e6aae444ac7" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_02b0102a-5730-47be-ab68-d7e143ec4af8" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_d21a3fd5-d644-4ccf-9c1a-1e6aae444ac7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_34775687-c80d-4672-ac48-0b669065ab16" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_d21a3fd5-d644-4ccf-9c1a-1e6aae444ac7" xlink:to="loc_us-gaap_StatementClassOfStockAxis_34775687-c80d-4672-ac48-0b669065ab16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_34775687-c80d-4672-ac48-0b669065ab16_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_34775687-c80d-4672-ac48-0b669065ab16" xlink:to="loc_us-gaap_ClassOfStockDomain_34775687-c80d-4672-ac48-0b669065ab16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_a6e65c96-ba5b-46a9-aa04-9d9f48124daf" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_34775687-c80d-4672-ac48-0b669065ab16" xlink:to="loc_us-gaap_ClassOfStockDomain_a6e65c96-ba5b-46a9-aa04-9d9f48124daf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_964c459b-d2f3-4fd4-a4b2-9173c8a9284c" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_a6e65c96-ba5b-46a9-aa04-9d9f48124daf" xlink:to="loc_us-gaap_CommonClassAMember_964c459b-d2f3-4fd4-a4b2-9173c8a9284c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassBMember_ead5c3a3-f83b-42b8-b51a-4d1127cdff28" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_CommonClassBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_a6e65c96-ba5b-46a9-aa04-9d9f48124daf" xlink:to="loc_us-gaap_CommonClassBMember_ead5c3a3-f83b-42b8-b51a-4d1127cdff28" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholdersAntidilutiveDetails" xlink:type="simple" xlink:href="crwd-20201031.xsd#NetLossPerShareAttributabletoCommonStockholdersAntidilutiveDetails"/>
  <link:definitionLink xlink:role="http://www.crowdstrike.com/role/NetLossPerShareAttributabletoCommonStockholdersAntidilutiveDetails" xlink:type="extended" id="i958b12504adb4664ad611b63e0262b79_NetLossPerShareAttributabletoCommonStockholdersAntidilutiveDetails">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_f86b4d5a-1f18-49a9-b2ed-e4e3af15aec6" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_8cede63a-427e-40ea-b415-28c4cdeff9da" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_f86b4d5a-1f18-49a9-b2ed-e4e3af15aec6" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_8cede63a-427e-40ea-b415-28c4cdeff9da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_5f742e8e-3433-4972-8bf7-c7d55474b3a0" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_f86b4d5a-1f18-49a9-b2ed-e4e3af15aec6" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_5f742e8e-3433-4972-8bf7-c7d55474b3a0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_7699cd07-458b-4e9a-a4fa-8d998d52be4f" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_5f742e8e-3433-4972-8bf7-c7d55474b3a0" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_7699cd07-458b-4e9a-a4fa-8d998d52be4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_7699cd07-458b-4e9a-a4fa-8d998d52be4f_default" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_7699cd07-458b-4e9a-a4fa-8d998d52be4f" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_7699cd07-458b-4e9a-a4fa-8d998d52be4f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_57ae0a72-3753-4317-999d-af982dd3f036" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_7699cd07-458b-4e9a-a4fa-8d998d52be4f" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_57ae0a72-3753-4317-999d-af982dd3f036" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_StockRepurchaseFromOutstandingStockOptionsMember_9b7fe67e-c9a0-4b3e-b709-17030fd852ed" xlink:href="crwd-20201031.xsd#crwd_StockRepurchaseFromOutstandingStockOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_57ae0a72-3753-4317-999d-af982dd3f036" xlink:to="loc_crwd_StockRepurchaseFromOutstandingStockOptionsMember_9b7fe67e-c9a0-4b3e-b709-17030fd852ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_56588425-2824-4a8c-99f7-edb915a16b10" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_57ae0a72-3753-4317-999d-af982dd3f036" xlink:to="loc_us-gaap_RestrictedStockMember_56588425-2824-4a8c-99f7-edb915a16b10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_2b9f4187-0095-49ef-b4a7-3a3dfcf98472" xlink:href="http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_57ae0a72-3753-4317-999d-af982dd3f036" xlink:to="loc_us-gaap_EmployeeStockOptionMember_2b9f4187-0095-49ef-b4a7-3a3dfcf98472" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_crwd_SharePurchaseRightsUnderEmployeeStockPurchasePlanMember_3549c1da-1935-4c24-8694-33db7837bb11" xlink:href="crwd-20201031.xsd#crwd_SharePurchaseRightsUnderEmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_57ae0a72-3753-4317-999d-af982dd3f036" xlink:to="loc_crwd_SharePurchaseRightsUnderEmployeeStockPurchasePlanMember_3549c1da-1935-4c24-8694-33db7837bb11" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
