Ownership Submission
FORM 3
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  Welzenbach Mark Joseph
 2. Date of Event Requiring Statement (Month/Day/Year)
05/14/2013		 3. Issuer Name and Ticker or Trading Symbol
HANOVER INSURANCE GROUP, INC. [THG]
(Last)
(First)
(Middle)
440 LINCOLN STREET, S-316		 4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
Senior Vice President
 5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

WORCESTER, MA 01653		 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)		 2. Amount of Securities Beneficially Owned
(Instr. 4)		 3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)		 4. Nature of Indirect Beneficial Ownership
(Instr. 5)
Common Stock 25,736 (1)
D
 

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)		 2. Date Exercisable and Expiration Date
(Month/Day/Year)		 3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)		 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)		 6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Common Stock Option (right to buy)   (2) 02/23/2017 Common Stock 5,415 $ 48.46 D  
Common Stock Option (right to buy)   (3) 02/26/2020 Common Stock 5,000 $ 42.15 D  
Common Stock Option (right to buy)   (4) 02/28/2021 Common Stock 10,000 $ 46.47 D  
Common Stock Option (right to buy)   (5) 01/20/2022 Common Stock 12,500 $ 36.81 D  
Common Stock Option (right to buy)   (6) 02/26/2013 Common Stock 15,000 $ 42.49 D  

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
Welzenbach Mark Joseph
440 LINCOLN STREET
S-316
WORCESTER, MA 01653		       Senior Vice President  

Signatures

Mark Welzenbach 05/14/2013
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) Includes (i) 2,000 restricted stock units ("RSUs") that vest on 2/26/14; (ii) 1,250 RSUs that vest 50% on 2/28/14 and 50% on 2/28/15; (iii) 250 RSUs that vest 50% on 3/10/14 and 50% on 3/10/15; (iv) 2,500 restricted shares that vest on 1/20/14; (v) 2,250 RSUs that vest 50% on 1/20/15 and 50% on 1/20/16; and (vi) 2,150 RSUs that vest on 2/26/16. In each case the Reporting Person must be continuously employed by the Issuer through the applicable vesting date for the awards to vest. Upon vesting the RSUs convert into an equivalent number of shares of common stock.
(2) 25% vested on 2/23/08, 25% vested on 2/23/09, and remaining 50% vested on 2/23/10.
(3) 50% vested on 2/26/13 and remaining 50% vest on 2/26/14.
(4) 50% vest on 2/28/14 and remaining 50% vest on 2/28/15.
(5) 50% vest on 1/20/15 and remaining 50% vest on 1/20/16.
(6) 33% vest on each of 2/26/14, 2/26/15 and 2/26/16.

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