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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019ead9a-3937-707b-8cbf-2e982a3a29e5,g:b68521ea-98ca-4026-bf11-8444ad4e1b31-->
<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.dxc.com/role/CoverPage" xlink:type="simple" xlink:href="dxc-20260611.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.dxc.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_019ead9a-3937-7c84-9b54-05f5136b278e" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_EntitiesTable_019ead9a-3937-7c84-9b54-05f5136b278e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019ead9a-3937-71c7-9349-d806c9e0bb9f" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_019ead9a-3937-7c84-9b54-05f5136b278e" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019ead9a-3937-71c7-9349-d806c9e0bb9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ead9a-3937-71c7-9349-d806c9e0bb9f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019ead9a-3937-71c7-9349-d806c9e0bb9f" xlink:to="loc_us-gaap_ClassOfStockDomain_019ead9a-3937-71c7-9349-d806c9e0bb9f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ead9a-3937-73f0-9e3b-4cfcdf53e8c2" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019ead9a-3937-71c7-9349-d806c9e0bb9f" xlink:to="loc_us-gaap_ClassOfStockDomain_019ead9a-3937-73f0-9e3b-4cfcdf53e8c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019ead9a-3937-7471-a65c-024de5abbc55" xlink:href="https://xbrl.fasb.org/us-gaap/2024/elts/us-gaap-2024.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ead9a-3937-73f0-9e3b-4cfcdf53e8c2" xlink:to="loc_us-gaap_CommonStockMember_019ead9a-3937-7471-a65c-024de5abbc55" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dxc_SeniorNotesDue2026Member_019ead9a-3937-783e-bb57-9ce8e52f84e4" xlink:href="dxc-20260611.xsd#dxc_SeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ead9a-3937-73f0-9e3b-4cfcdf53e8c2" xlink:to="loc_dxc_SeniorNotesDue2026Member_019ead9a-3937-783e-bb57-9ce8e52f84e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019ead9a-3937-7037-83ce-354a2c40902c" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_DocumentType_019ead9a-3937-7037-83ce-354a2c40902c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019ead9a-3937-739a-b2c8-fdc4fee1c9d0" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_DocumentPeriodEndDate_019ead9a-3937-739a-b2c8-fdc4fee1c9d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019ead9a-3937-737d-9c63-93cd4b70c2e4" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_EntityRegistrantName_019ead9a-3937-737d-9c63-93cd4b70c2e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019ead9a-3937-714e-bc32-5de346d37159" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019ead9a-3937-714e-bc32-5de346d37159" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019ead9a-3937-7fa2-941c-a90162a3a321" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_EntityFileNumber_019ead9a-3937-7fa2-941c-a90162a3a321" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019ead9a-3937-7274-aee1-d2f962116269" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_EntityTaxIdentificationNumber_019ead9a-3937-7274-aee1-d2f962116269" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019ead9a-3937-7ba6-b217-2856b9bf502e" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_EntityAddressAddressLine1_019ead9a-3937-7ba6-b217-2856b9bf502e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019ead9a-3937-78eb-b9dc-8ba4031476c2" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_EntityAddressCityOrTown_019ead9a-3937-78eb-b9dc-8ba4031476c2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019ead9a-3937-7414-8cf3-507a7444d172" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_EntityAddressStateOrProvince_019ead9a-3937-7414-8cf3-507a7444d172" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019ead9a-3937-7892-86b2-a2284ba0034c" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_EntityAddressPostalZipCode_019ead9a-3937-7892-86b2-a2284ba0034c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019ead9a-3937-76bc-b560-01dff0684964" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_CityAreaCode_019ead9a-3937-76bc-b560-01dff0684964" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019ead9a-3937-700a-9a3b-03c6f3da9fa6" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_LocalPhoneNumber_019ead9a-3937-700a-9a3b-03c6f3da9fa6" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019ead9a-3937-74d3-a38d-08e2d0bac608" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_WrittenCommunications_019ead9a-3937-74d3-a38d-08e2d0bac608" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019ead9a-3937-7c75-a165-16027661cdba" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_SolicitingMaterial_019ead9a-3937-7c75-a165-16027661cdba" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019ead9a-3937-7b0e-b7f7-eaee25b58d3c" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_PreCommencementTenderOffer_019ead9a-3937-7b0e-b7f7-eaee25b58d3c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019ead9a-3937-71ea-ba1d-e1bd5c3fd6a1" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019ead9a-3937-71ea-ba1d-e1bd5c3fd6a1" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019ead9a-3937-7f17-a831-580ff4b526fd" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_Security12bTitle_019ead9a-3937-7f17-a831-580ff4b526fd" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019ead9a-3937-76b1-9b72-79e13bb5fdc9" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_TradingSymbol_019ead9a-3937-76b1-9b72-79e13bb5fdc9" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019ead9a-3937-7230-8c4c-b38768c8a537" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_SecurityExchangeName_019ead9a-3937-7230-8c4c-b38768c8a537" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019ead9a-3937-7fdb-a2e5-395e1ada3ae0" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_EntityEmergingGrowthCompany_019ead9a-3937-7fdb-a2e5-395e1ada3ae0" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019ead9a-3937-7cee-bd3f-ed23a5b0e0db" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_EntityCentralIndexKey_019ead9a-3937-7cee-bd3f-ed23a5b0e0db" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019ead9a-3937-7b14-8d77-e2cf194beac2" xlink:href="https://xbrl.sec.gov/dei/2024/dei-2024.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019ead9a-3937-773b-8c67-90929b620b50" xlink:to="loc_dei_AmendmentFlag_019ead9a-3937-7b14-8d77-e2cf194beac2" xlink:type="arc" order="21"/>
  </link:definitionLink>
</link:linkbase>
