FORM 10-Q/A
                                (Amendment No. 1)

                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


                        FOR QUARTER ENDED MARCH 31, 2005

                         COMMISSION FILE NUMBER 0-12422

                        MAINSOURCE FINANCIAL GROUP, INC.
             (Exact name of registrant as specified in its charter)

         INDIANA                                             35-1562245
         -------                                             ----------
 (State or other jurisdiction of                          (IRS Employer
 incorporation or organization)                         Identification No.)

                  201 NORTH BROADWAY GREENSBURG, INDIANA 47240
                  ------------------ ------------------- -----
               (Address of principal executive offices) (Zip Code)

                                 (812) 663-0157
              (Registrant's telephone number, including area code)

                                       N/A
              (Former name, former address and former fiscal year,
                         if changed since last report.)

         Indicate by check mark whether the registrant (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes X No ___


     Indicate by check mark whether the registrant is an  accelerated  filer (as
defined in Rule 12B-2 of the Act) Yes X  No ___

         As of August 4, 2005 there were outstanding 13,471,128 shares of common
stock, without par value, of the registrant.






                        MAINSOURCE FINANCIAL GROUP, INC.

                   AMENDMENT TO FORM 10-Q FOR QUARTERLY PERIOD
                              ENDED MARCH 31, 2005

Explanatory Note:

         This amendment revises Item 2 (Unregistered Sales of Equity Securities)
of Part II to the Quarterly Report on Form 10-Q of MainSource Financial Group,
Inc. (the "Company") for the quarter ended March 31, 2005 (the "Original
Report") to include the Company's repurchase of certain shares of its common
stock in consideration for the sale of a portion of its insurance subsidiary.

         Except for the correction described above, the Company has not modified
or updated disclosures presented in the Original Report. Accordingly, this Form
10-Q/A does not reflect events occurring after the filing of the Original Report
or modify or update those disclosures affected by subsequent events. Information
not affected by this amendment is unchanged and reflects the disclosure made at
the time the Original Report was filed. This Form 10-Q/A should be read in
conjunction with the Original Report and the filings made with the Securities
and Exchange Commission subsequent to the filing of the Original Report,
including any amendments to any such filings.







MAINSOURCE FINANCIAL GROUP, INC.
FORM 10-Q/A

PART II.  OTHER INFORMATION

Item 2.  Unregistered Sales of Equity Securities and Use of Proceeds

         During the first quarter of 2005, the Company repurchased the following
shares of its common stock:


                                                                                     

                                                                     Total Number of Shares    Maximum Number (or Approximate
                                                                      Purchased as Part of    Dollar Value) of Shares That May
                          Total Number of                              Publicly Announced     Yet Be Purchased Under the Plans
                         Shares Purchased     Average Price Paid       Plans or Programs               or Programs (1)
        Period                                     Per Share


January 2005                                                                                            487,048
February 2005                1,209(2)              $22.55                   1,209                             0
March 2005                  62,928(3)              $21.93                     0                               0



(1)      On January 27, 2004, the Company announced that its Board of Directors
         had approved a stock repurchase program for up to 255,000 of its
         outstanding common shares. This plan was expanded by the Board of
         Directors on August 17, 2004 to include an additional 295,000 shares.
         The plan expired January 31, 2005.

(2)      This transaction was negotiated and agreed to in January 2005, but was
         consummated during February 2005.

(3)      On March 24, 2005, the Company consummated the sale of the Kentucky
         division of its insurance subsidiary, MainSource Insurance, LLC. In
         consideration of the sale, MainSource received 62,928 shares of its
         common stock with an approximate value of $1.380 million.

Item 6.  Exhibits

         31.1 Certification pursuant to Rule 13a-14(a)/15d-14(a) by Chief
              Executive Officer

         31.2 Certification pursuant to Rule 13a-14(a)/15d-14(a) by Chief
              Financial Officer






MAINSOURCE FINANCIAL GROUP, INC.
FORM 10-Q/A

                                   SIGNATURES

         Pursuant to the requirements of the Securities and Exchange Act of
1934, the Registrant has duly caused this report to be signed on its behalf by
the undersigned thereunto duly authorized.


                                       August 5, 2005

                                       /s/ James L. Saner, Sr.
                                       James L. Saner Sr.
                                       President and Chief Executive Officer

                                       August 5, 2005

                                       /s/ Donald A. Benziger
                                       Donald A. Benziger
                                       Senior Vice President & Chief Financial
                                       Officer


                                       August 5, 2005

                                       /s/ James M. Anderson
                                       James M. Anderson
                                       Administrative Vice President & Principal
                                       Accounting Officer