content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
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      <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>24408</noOfUnitsSold>
        <aggregateMarketValue>1569985.27</aggregateMarketValue>
        <noOfUnitsOutstanding>62485521</noOfUnitsOutstanding>
        <approxSaleDate>12/12/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>05/20/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1932</amountOfSecuritiesAcquired>
        <paymentDate>05/20/2022</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/21/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1767</amountOfSecuritiesAcquired>
        <paymentDate>02/21/2023</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/20/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1212</amountOfSecuritiesAcquired>
        <paymentDate>02/20/2024</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>11/20/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>7955</amountOfSecuritiesAcquired>
        <paymentDate>11/20/2024</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>12/12/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Options Granted 08/07/2018</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>7998</amountOfSecuritiesAcquired>
        <paymentDate>12/12/2024</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>12/12/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Options Granted 05/15/2019</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>3544</amountOfSecuritiesAcquired>
        <paymentDate>12/12/2024</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>12/12/2024</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>09/13/2024</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Mark Woodhams </signature>
      </noticeSignature>
    </formData>
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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
  24408
  1569985.27
  62485521
  12/12/2024
  NASDAQ
  Common
  05/20/2022
  Restricted Stock Vesting
  Issuer
  N
  1932
  05/20/2022
  Compensation
  Common
  02/21/2023
  Restricted Stock Vesting
  Issuer
  N
  1767
  02/21/2023
  Compensation
  Common
  02/20/2024
  Restricted Stock Vesting
  Issuer
  N
  1212
  02/20/2024
  Compensation
  Common
  11/20/2024
  Restricted Stock Vesting
  Issuer
  N
  7955
  11/20/2024
  Compensation
  Common
  12/12/2024
  Options Granted 08/07/2018
  Issuer
  N
  7998
  12/12/2024
  Cash
  Common
  12/12/2024
  Options Granted 05/15/2019
  Issuer
  N
  3544
  12/12/2024
  Cash
  Y
  12/12/2024
  09/13/2024
  /s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Mark Woodhams