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): August 17, 2005

                        MainSource Financial Group, Inc.
             (Exact name of registrant as specified in its charter)

          Indiana                     0-12422                      35-1562245
State or Other Jurisdiction of    Commission File No.          I.R.S. Employer
Incorporation or Organization                              dentification Number



                               201 North Broadway
                            Greensburg, Indiana 47240
                    (Address of principal executive offices)

                                 (812) 663-0157
                         (Registrant's Telephone Number,
                              Including Area Code)

                                       N/A
          (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-4(c))




Item 7.01.             Regulation FD Disclosure

On August 17, 2005,  MainSource Financial Group, Inc. (the "Company"),  issued a
press release announcing that the Company declared a third quarter dividend. The
press  release is attached  hereto as an exhibit to this Current  Report on Form
8-K and is being  furnished  pursuant to this Item 7.01 as Exhibit  99.1 to this
Current Report on Form 8-K.


Item 9.01.    Financial Statements and Exhibits

(c)   Exhibits

Exhibit No.                       Description

  99.1   MainSource Financial Group, Inc.'s press release dated August 17, 2005.


                                    Signature

         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, thereunto duly authorized.

                                      MAINSOURCE FINANCIAL GROUP, INC.

Date:    August 17, 2005              By:  /s/ Donald A. Benziger
                                      -----------------------------
                                      Donald A. Benziger
                                      Senior Vice President and Chief Financial
                                      Officer