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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:49aad46e-7f9c-4e8f-be5f-caf06e390d1d,g:5717e500-b6b7-4ca5-9ea2-bffb12bd054b-->
<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.valaris.com/role/DocumentandEntityInformationDocument" xlink:type="simple" xlink:href="val-20211027.xsd#DocumentandEntityInformationDocument"/>
  <link:definitionLink xlink:role="http://www.valaris.com/role/DocumentandEntityInformationDocument" xlink:type="extended" id="i7fbedd0ed861403f987ca8467875a80e_DocumentandEntityInformationDocument">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_15e3d39b-bbe5-4d3b-881f-4571525e6eb5" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_EntityCentralIndexKey_15e3d39b-bbe5-4d3b-881f-4571525e6eb5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_31db80a2-905c-4fee-aed8-1e70743fea6c" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_DocumentType_31db80a2-905c-4fee-aed8-1e70743fea6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_995b57bd-0d5e-408e-98c7-6ca01780aa13" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_DocumentPeriodEndDate_995b57bd-0d5e-408e-98c7-6ca01780aa13" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_a612a1cd-93df-41e9-9889-e3551c0e30b6" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_EntityRegistrantName_a612a1cd-93df-41e9-9889-e3551c0e30b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_f458f6ce-21d5-4390-a45c-d2b7b5f978bc" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_EntityIncorporationStateCountryCode_f458f6ce-21d5-4390-a45c-d2b7b5f978bc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_dd9e1d84-7dcf-4797-85af-b37d79f964ed" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_EntityFileNumber_dd9e1d84-7dcf-4797-85af-b37d79f964ed" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_01973419-d9ef-4bcc-90e7-6b790f8d8acd" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_EntityTaxIdentificationNumber_01973419-d9ef-4bcc-90e7-6b790f8d8acd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_87ff073c-7e58-4f7d-9287-7e3b8c0712a4" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_EntityAddressAddressLine1_87ff073c-7e58-4f7d-9287-7e3b8c0712a4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_630d0777-793c-4892-ab44-86d2eb2c1cb0" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_EntityAddressCityOrTown_630d0777-793c-4892-ab44-86d2eb2c1cb0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCountry_42dcaa42-d233-4338-86f6-2a4439e3ecb0" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressCountry"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_EntityAddressCountry_42dcaa42-d233-4338-86f6-2a4439e3ecb0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_d126e674-891e-432b-ba8b-e0e25471e16f" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_EntityAddressPostalZipCode_d126e674-891e-432b-ba8b-e0e25471e16f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_3bedcce4-3ae9-4db4-b1ca-ddb8a1ba9de2" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_CityAreaCode_3bedcce4-3ae9-4db4-b1ca-ddb8a1ba9de2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_3380eec9-d5f8-48d9-861b-44740238448b" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_LocalPhoneNumber_3380eec9-d5f8-48d9-861b-44740238448b" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_80e3c792-81cc-4e19-be22-bc94a83ea6c3" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_WrittenCommunications_80e3c792-81cc-4e19-be22-bc94a83ea6c3" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_cb4f069c-7134-4cb3-bd58-a8fca67a55ff" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_SolicitingMaterial_cb4f069c-7134-4cb3-bd58-a8fca67a55ff" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_610038c4-84b1-4f79-b795-f653ffadc8d0" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_PreCommencementTenderOffer_610038c4-84b1-4f79-b795-f653ffadc8d0" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_d74138a3-7c29-41ea-875f-e80e7a322162" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_d74138a3-7c29-41ea-875f-e80e7a322162" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_60607f26-8bf9-4759-bf80-f5a7c2355edb" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_EntityEmergingGrowthCompany_60607f26-8bf9-4759-bf80-f5a7c2355edb" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_39353d97-0f03-4cd7-a0a2-740dce44828d" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_AmendmentFlag_39353d97-0f03-4cd7-a0a2-740dce44828d" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_3dd7b6be-6053-4f9f-92b7-a0ec047902f6" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_Security12bTitle_3dd7b6be-6053-4f9f-92b7-a0ec047902f6" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_05301728-9ca2-4e86-a909-d81b918e26c0" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_TradingSymbol_05301728-9ca2-4e86-a909-d81b918e26c0" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_21431ead-e321-4136-8dd3-8962b54a98f2" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_SecurityExchangeName_21431ead-e321-4136-8dd3-8962b54a98f2" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_a4dd95af-925b-4fa8-88dd-017047b1b08c" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_6ddbe97b-7e43-4524-996a-991a7f9f1c77" xlink:to="loc_dei_EntitiesTable_a4dd95af-925b-4fa8-88dd-017047b1b08c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_5d4c2cf4-3ffa-4e9f-8a2a-4603ae415412" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_a4dd95af-925b-4fa8-88dd-017047b1b08c" xlink:to="loc_us-gaap_StatementClassOfStockAxis_5d4c2cf4-3ffa-4e9f-8a2a-4603ae415412" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_5d4c2cf4-3ffa-4e9f-8a2a-4603ae415412_default" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_5d4c2cf4-3ffa-4e9f-8a2a-4603ae415412" xlink:to="loc_us-gaap_ClassOfStockDomain_5d4c2cf4-3ffa-4e9f-8a2a-4603ae415412_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_fe5a09ed-92e0-4728-b6d2-35591c01ee74" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_5d4c2cf4-3ffa-4e9f-8a2a-4603ae415412" xlink:to="loc_us-gaap_ClassOfStockDomain_fe5a09ed-92e0-4728-b6d2-35591c01ee74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_483d2531-e473-412d-a2ea-06cc01b720ef" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_fe5a09ed-92e0-4728-b6d2-35591c01ee74" xlink:to="loc_us-gaap_CommonClassAMember_483d2531-e473-412d-a2ea-06cc01b720ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantMember_17994a82-58fb-4709-8c35-ad9b8fff9d0e" xlink:href="https://xbrl.fasb.org/us-gaap/2021/elts/us-gaap-2021-01-31.xsd#us-gaap_WarrantMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_fe5a09ed-92e0-4728-b6d2-35591c01ee74" xlink:to="loc_us-gaap_WarrantMember_17994a82-58fb-4709-8c35-ad9b8fff9d0e" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
