content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
    <headerData>
      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001838158</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001666134</issuerCik>
        <issuerName>BLACKLINE, INC.</issuerName>
        <secFileNumber>001-37924</secFileNumber>
        <issuerAddress>
          <com:street1>21300 VICTORY BOULEVARD</com:street1>
          <com:street2>12TH FLOOR</com:street2>
          <com:city>WOODLAND HILLS</com:city>
          <com:stateOrCountry>CA</com:stateOrCountry>
          <com:zipCode>91367</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>818-223-9008</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Woodhams Mark</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Fidelity Brokerage Services LLC</name>
          <address>
            <com:street1>900 Salem Street</com:street1>
            <com:city>Smithfield</com:city>
            <com:stateOrCountry>RI</com:stateOrCountry>
            <com:zipCode>02917</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>9088</noOfUnitsSold>
        <aggregateMarketValue>451400.96</aggregateMarketValue>
        <noOfUnitsOutstanding>62485521</noOfUnitsOutstanding>
        <approxSaleDate>02/21/2025</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/20/2025</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>9088</amountOfSecuritiesAcquired>
        <paymentDate>02/20/2025</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Mark Woodhams</name>
          <address>
            <com:street1>21300 Victory Boulevard</com:street1>
            <com:street2>12th Floor</com:street2>
            <com:city>Woodland Hills</com:city>
            <com:stateOrCountry>CA</com:stateOrCountry>
            <com:zipCode>91367</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>12/12/2024</saleDate>
        <amountOfSecuritiesSold>24408</amountOfSecuritiesSold>
        <grossProceeds>1569985.45</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>02/21/2025</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>09/13/2024</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/ Eric Janiak, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Mark Woodhams</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 3631}]
text: 144
  0001838158
  XXXXXXXX
  LIVE
  0001666134
  BLACKLINE, INC.
  001-37924
  21300 VICTORY BOULEVARD
  12TH FLOOR
  WOODLAND HILLS
  CA
  91367
  818-223-9008
  Woodhams Mark
  Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  9088
  451400.96
  62485521
  02/21/2025
  NASDAQ
  Common
  02/20/2025
  Restricted Stock Vesting
  Issuer
  N
  9088
  02/20/2025
  Compensation
  N
  Mark Woodhams
  21300 Victory Boulevard
  12th Floor
  Woodland Hills
  CA
  91367
  Common
  12/12/2024
  24408
  1569985.45
  02/21/2025
  09/13/2024
  /s/ Eric Janiak, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Mark Woodhams