<?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>0001275634</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>FARBER JEFFREY M</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>6114</noOfUnitsSold>
      <aggregateMarketValue>992669.12</aggregateMarketValue>
      <noOfUnitsOutstanding>36033351</noOfUnitsOutstanding>
      <approxSaleDate>11/11/2024</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>03/18/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>4910</amountOfSecuritiesAcquired>
      <paymentDate>03/18/2022</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>03/05/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>1204</amountOfSecuritiesAcquired>
      <paymentDate>03/05/2022</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Jeffrey M. Farber</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>09/17/2024</saleDate>
      <amountOfSecuritiesSold>300</amountOfSecuritiesSold>
      <grossProceeds>45001.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Jeffrey M. Farber</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>09/18/2024</saleDate>
      <amountOfSecuritiesSold>2550</amountOfSecuritiesSold>
      <grossProceeds>382600.15</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Jeffrey M. Farber</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>09/19/2024</saleDate>
      <amountOfSecuritiesSold>1200</amountOfSecuritiesSold>
      <grossProceeds>180134.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Jeffrey M. Farber</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>10/01/2024</saleDate>
      <amountOfSecuritiesSold>300</amountOfSecuritiesSold>
      <grossProceeds>45007.50</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Jeffrey M. Farber</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>10/10/2024</saleDate>
      <amountOfSecuritiesSold>151</amountOfSecuritiesSold>
      <grossProceeds>22651.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Jeffrey M. Farber</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>10/15/2024</saleDate>
      <amountOfSecuritiesSold>4800</amountOfSecuritiesSold>
      <grossProceeds>721945.00</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Jeffrey M. Farber</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>10/16/2024</saleDate>
      <amountOfSecuritiesSold>2699</amountOfSecuritiesSold>
      <grossProceeds>407214.54</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Jeffrey M. Farber</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>10/18/2024</saleDate>
      <amountOfSecuritiesSold>12000</amountOfSecuritiesSold>
      <grossProceeds>1860945.15</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Jeffrey M. Farber</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>11/08/2024</saleDate>
      <amountOfSecuritiesSold>5886</amountOfSecuritiesSold>
      <grossProceeds>942078.31</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>11/12/2024</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>02/15/2023</planAdoptionDate>
      </planAdoptionDates>
      <signature>s/ Eric Janiak, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Jeffrey M. Farber</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
