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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fb9e4-4d32-7706-8ed1-054a27984e3d,g:c100e8df-3b71-4570-8b88-9520eacc47a3-->
<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" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.blackline.com/role/Cover" xlink:type="simple" xlink:href="bl-20260731.xsd#Cover"/>
  <link:presentationLink xlink:role="http://www.blackline.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019fb9e4-4d32-7ba1-b151-98f416d2e636" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_DocumentType_019fb9e4-4d32-7ba1-b151-98f416d2e636" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019fb9e4-4d32-7a20-b253-a2000a4dc636" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_DocumentPeriodEndDate_019fb9e4-4d32-7a20-b253-a2000a4dc636" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019fb9e4-4d32-7f44-a8c6-bbcb1415f53e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019fb9e4-4d32-7f44-a8c6-bbcb1415f53e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019fb9e4-4d32-7ecb-8cd0-3b7d8050be57" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_EntityFileNumber_019fb9e4-4d32-7ecb-8cd0-3b7d8050be57" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019fb9e4-4d32-7c19-94c6-ea78d84f1b5f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_EntityTaxIdentificationNumber_019fb9e4-4d32-7c19-94c6-ea78d84f1b5f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019fb9e4-4d32-71fc-a330-27347c373c81" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_EntityAddressAddressLine1_019fb9e4-4d32-71fc-a330-27347c373c81" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_019fb9e4-4d32-72ce-b78f-91eb2dcd8948" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine2"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_EntityAddressAddressLine2_019fb9e4-4d32-72ce-b78f-91eb2dcd8948" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019fb9e4-4d32-7c02-a743-0a4f6324ac61" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_EntityAddressCityOrTown_019fb9e4-4d32-7c02-a743-0a4f6324ac61" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019fb9e4-4d32-7240-a556-d6ac0ab1edf6" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_EntityAddressStateOrProvince_019fb9e4-4d32-7240-a556-d6ac0ab1edf6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019fb9e4-4d32-792e-8019-251b0025b4c9" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_EntityAddressPostalZipCode_019fb9e4-4d32-792e-8019-251b0025b4c9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019fb9e4-4d32-73f8-bafd-9387236de6be" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_CityAreaCode_019fb9e4-4d32-73f8-bafd-9387236de6be" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019fb9e4-4d32-7197-a28e-793d6753f56e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_LocalPhoneNumber_019fb9e4-4d32-7197-a28e-793d6753f56e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019fb9e4-4d32-78db-b349-dfb252d49953" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_WrittenCommunications"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_WrittenCommunications_019fb9e4-4d32-78db-b349-dfb252d49953" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019fb9e4-4d32-7e1f-a2e9-3f33086b2ce5" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SolicitingMaterial"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_SolicitingMaterial_019fb9e4-4d32-7e1f-a2e9-3f33086b2ce5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019fb9e4-4d32-7c7d-b300-12c6c7248060" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementTenderOffer"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_PreCommencementTenderOffer_019fb9e4-4d32-7c7d-b300-12c6c7248060" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019fb9e4-4d32-7b7d-a865-5743bc75edff" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019fb9e4-4d32-7b7d-a865-5743bc75edff" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019fb9e4-4d32-752c-988f-1701cf9ab5b7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_Security12bTitle_019fb9e4-4d32-752c-988f-1701cf9ab5b7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019fb9e4-4d32-7b33-8b2c-a9eae08f1766" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_TradingSymbol_019fb9e4-4d32-7b33-8b2c-a9eae08f1766" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019fb9e4-4d32-7539-9690-6d53df54f898" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_SecurityExchangeName_019fb9e4-4d32-7539-9690-6d53df54f898" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019fb9e4-4d32-7e02-9faf-abfd0dcbd62b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_EntityEmergingGrowthCompany_019fb9e4-4d32-7e02-9faf-abfd0dcbd62b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019fb9e4-4d32-7539-be43-ba1f0ae71723" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_EntityCentralIndexKey_019fb9e4-4d32-7539-be43-ba1f0ae71723" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019fb9e4-4d32-769b-81bd-571809af69df" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_AmendmentFlag_019fb9e4-4d32-769b-81bd-571809af69df" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019fb9e4-4d32-7509-8453-05f717b8c3ea" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="23" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_019fb9e4-4d32-79ec-8462-4105f65028cd" xlink:to="loc_dei_EntityRegistrantName_019fb9e4-4d32-7509-8453-05f717b8c3ea" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
