<SEC-DOCUMENT>0000944695-17-000117.txt : 20171115
<SEC-HEADER>0000944695-17-000117.hdr.sgml : 20171115
<ACCEPTANCE-DATETIME>20171115095827
ACCESSION NUMBER:		0000944695-17-000117
CONFORMED SUBMISSION TYPE:	13F-NT
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20170930
FILED AS OF DATE:		20171115
DATE AS OF CHANGE:		20171115
EFFECTIVENESS DATE:		20171115

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			HANOVER INSURANCE GROUP, INC.
		CENTRAL INDEX KEY:			0000944695
		STANDARD INDUSTRIAL CLASSIFICATION:	FIRE, MARINE & CASUALTY INSURANCE [6331]
		IRS NUMBER:				043263626
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		13F-NT
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	028-05460
		FILM NUMBER:		171204082

	BUSINESS ADDRESS:	
		STREET 1:		440 LINCOLN ST
		CITY:			WORCESTER
		STATE:			MA
		ZIP:			01653
		BUSINESS PHONE:		5088551000

	MAIL ADDRESS:	
		STREET 1:		440 LINCOLN ST
		CITY:			WORCESTER
		STATE:			MA
		ZIP:			01653

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	ALLMERICA FINANCIAL CORP
		DATE OF NAME CHANGE:	19950501
</SEC-HEADER>
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<SEQUENCE>1
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          <cik>0000944695</cik>
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      <periodOfReport>09-30-2017</periodOfReport>
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    <coverPage>
      <reportCalendarOrQuarter>09-30-2017</reportCalendarOrQuarter>
      <filingManager>
        <name>HANOVER INSURANCE GROUP, INC.</name>
        <address>
          <com:street1>440 LINCOLN ST</com:street1>
          <com:city>WORCESTER</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>01653</com:zipCode>
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          <name>OPUS INVESTMENT MANAGEMENT INC</name>
        </otherManager>
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      <provideInfoForInstruction5>N</provideInfoForInstruction5>
    </coverPage>
    <signatureBlock>
      <name>Ann K. Tripp</name>
      <title>President</title>
      <phone>508-855-3856</phone>
      <signature>/s/ Ann K. Tripp</signature>
      <city>Worcester</city>
      <stateOrCountry>MA</stateOrCountry>
      <signatureDate>10-27-2017</signatureDate>
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