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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): July 28, 2005

                             HARLEYSVILLE GROUP INC.
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             (Exact name of registrant as specified in its charter)

           Delaware                    0-14697                  51-0241172
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 (State or other jurisdiction        (Commission              (IRS Employer
      of incorporation)              File Number)          Identification No.)

   355 Maple Avenue, Harleysville, Pennsylvania                   19438
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     (Address of principal executive offices)                   (Zip Code)

                                 (215) 256-5000
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               Registrant's telephone number, including area code

                                 Not Applicable
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         (Former name or former address, if changed since last report.)

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:

[ ]  Written communications pursuant to Rule 425 under the Securities
     Act (17 CFR 230.425)

[ ]  Soliciting material pursuant to Rule 14a-12 under the Exchange
     Act (17 CFR 240.14a-12)

[ ]  Pre-commencement communications pursuant to Rule 14d-2(b) under the
     Exchange Act (17 CFR 240.14d-2(b))

[ ]  Pre-commencement communications pursuant to Rule 13e-4(c) under the
     Exchange Act (17 CFR 240.13e-4c)

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ITEM 2.02 RESULTS OF OPERATIONS AND FINANCIAL CONDITION.

     On July 28, 2005, Harleysville Group Inc. issued a press release reporting
its results for the second quarter of 2005 (furnished hereunder as Exhibit 99.1
and incorporated herein).

     The information provided in this Form 8-K, Item 2.02, Results of Operations
and Financial Condition, is being furnished and shall not be deemed "filed" for
purposes of Section 18 of the Securities Exchange Act of 1934 ("Exchange
Act"),or otherwise subject to the liabilities of that section, nor shall such
information be deemed incorporated by reference in any filing under the
Securities Act of 1933, or the Exchange Act, except as shall be expressly set
forth by specific reference in such filing.

     In addition to disclosing results that are determined in accordance with U.
S. generally accepted accounting principles (GAAP), the company also discloses
non-GAAP information on operating earnings. Management believes information on
operating earnings is useful to investors. Management has historically employed
operating earnings as a valuable measurement of the underlying profitability of
the Company's insurance operations since it excludes the impact of the Company's
investment results.

ITEM 9.01 FINANCIAL STATEMENTS AND EXHIBITS

     Exhibit 99.1 Press release "Harleysville Group Reports Second Quarter 2005
Results dated July 28, 2005.

                                   SIGNATURES

     Pursuant to the requirements 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.

                                                       HARLEYSVILLE GROUP INC.
                                                       Registrant

                                                       /s/Arthur E. Chandler
July 28, 2005                                          -------------------------
                                                       Arthur E. Chandler
                                                       Senior Vice President and
                                                       Chief Financial Officer

                                  EXHIBIT INDEX

Exhibit No.       Description
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99.1              Press release dated July 28, 2005 of Harleysville Group Inc.
                  (furnished pursuant to Item 2.02 hereof).