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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): April 20, 2012

Tower Group, Inc.

(Exact name of registrant as specified in its charter)

120 Broadway, 31^st Floor

New York, NY 10271

(Address of principal executive offices)

(212) 655-2000

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

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Item 7.01 Regulation FD Disclosure

Beginning on April 23, 2012, Tower Group, Inc. (“Tower”) will present the information attached to this Current Report on Form 8-K as Exhibit 99.1 to various investors. A copy of the Investor Presentation is furnished as Exhibit 99.1 to this report.

The information under this Item 7.01 and the Investor Presentation attached to this Form 8-K as Exhibit 99.1 shall be deemed to be “furnished” and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act.

Item 9.01 FINANCIAL STATEMENTS AND EXHIBITS.

(d) Exhibits

SIGNATURES

Pursuant to the requirement of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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EXHIBIT INDEX

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