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>0001269358</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000944695</issuerCik>
        <issuerName>HANOVER INSURANCE GROUP, INC.</issuerName>
        <secFileNumber>001-13754</secFileNumber>
        <issuerAddress>
          <com:street1>440 LINCOLN ST</com:street1>
          <com:city>WORCESTER</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>01653</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>5088551000</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>BARNES WARREN E.</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>1392</noOfUnitsSold>
        <aggregateMarketValue>225830.94</aggregateMarketValue>
        <noOfUnitsOutstanding>36033351</noOfUnitsOutstanding>
        <approxSaleDate>11/11/2024</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>11/11/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Option Granted- 02/26/2021</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1392</amountOfSecuritiesAcquired>
        <paymentDate>11/11/2024</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Warren E. Barnes</name>
          <address>
            <com:street1>440 Lincoln Street</com:street1>
            <com:city>Worcester</com:city>
            <com:stateOrCountry>MA</com:stateOrCountry>
            <com:zipCode>01653</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>08/26/2024</saleDate>
        <amountOfSecuritiesSold>500</amountOfSecuritiesSold>
        <grossProceeds>69090.12</grossProceeds>
      </securitiesSoldInPast3Months>
      <remarks>The trade on 08/26/2024 was made in the The Warren E Barnes 2020 Trust, in which Warren E. Barnes is a stakeholder. The trade on 11/11/2024 was made in the Individual account, owned by Warren E. Barnes. </remarks>
      <noticeSignature>
        <noticeDate>11/12/2024</noticeDate>
        <signature>/s/ Tyler Johnson, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Warren E. Barnes</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 3642}]
text: 144
  0001269358
  XXXXXXXX
  LIVE
  0000944695
  HANOVER INSURANCE GROUP, INC.
  001-13754
  440 LINCOLN ST
  WORCESTER
  MA
  01653
  5088551000
  BARNES WARREN E.
  Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  1392
  225830.94
  36033351
  11/11/2024
  NYSE
  Common
  11/11/2024
  Option Granted- 02/26/2021
  Issuer
  N
  1392
  11/11/2024
  Cash
  N
  Warren E. Barnes
  440 Lincoln Street
  Worcester
  MA
  01653
  Common
  08/26/2024
  500
  69090.12
  The trade on 08/26/2024 was made in the The Warren E Barnes 2020 Trust, in which Warren E. Barnes is a stakeholder. The trade on 11/11/2024 was made in the Individual account, owned by Warren E. Barnes.
  11/12/2024
  /s/ Tyler Johnson, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Warren E. Barnes