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>0001299455</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>Unterman Thomas</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Director</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>910</noOfUnitsSold>
        <aggregateMarketValue>50050.00</aggregateMarketValue>
        <noOfUnitsOutstanding>62320133</noOfUnitsOutstanding>
        <approxSaleDate>05/20/2025</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/03/2013</acquiredDate>
        <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>910</amountOfSecuritiesAcquired>
        <paymentDate>09/03/2013</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>The Etu Rustic Canyon Trust</name>
          <address>
            <com:street1>21300 Victory Boulevard, 12th Floor</com:street1>
            <com:city>Woodland Hills,</com:city>
            <com:stateOrCountry>CA</com:stateOrCountry>
            <com:zipCode>91367</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>05/12/2025</saleDate>
        <amountOfSecuritiesSold>2730</amountOfSecuritiesSold>
        <grossProceeds>150150.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <remarks>This trade took place in The Etu Rustic Canyon Trust of, which Thomas Unterman is an Account Stakeholder. In regards to sale from The Etu Rustic Canyon Trust on 05/12/2025 Thomas Unterman is an Account Stakeholder.</remarks>
      <noticeSignature>
        <noticeDate>05/20/2025</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>11/21/2024</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/ Jared Cook, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Thomas Unterman</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 3836}]
text: 144
  0001299455
  XXXXXXXX
  LIVE
  0001666134
  BLACKLINE, INC.
  001-37924
  21300 VICTORY BOULEVARD
  12TH FLOOR
  WOODLAND HILLS
  CA
  91367
  818-223-9008
  Unterman Thomas
  Director
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  910
  50050.00
  62320133
  05/20/2025
  NASDAQ
  Common
  09/03/2013
  Stock Option Exercise
  Issuer
  N
  910
  09/03/2013
  Cash
  N
  The Etu Rustic Canyon Trust
  21300 Victory Boulevard, 12th Floor
  Woodland Hills,
  CA
  91367
  Common
  05/12/2025
  2730
  150150.00
  This trade took place in The Etu Rustic Canyon Trust of, which Thomas Unterman is an Account Stakeholder. In regards to sale from The Etu Rustic Canyon Trust on 05/12/2025 Thomas Unterman is an Account Stakeholder.
  05/20/2025
  11/21/2024
  /s/ Jared Cook, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Thomas Unterman