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): March 31, 2006

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

          Indiana                        0-12422               35-1562245
  State or Other Jurisdiction       Commission File No.     I.R.S. Employer
  of Incorporation or Organization                         Identification 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 8.01.         Other Events

     On March 31, 2006,  MainSource Financial Group, Inc. issued a press release
announcing  that its Board of Directors has  authorized  the repurchase of up to
2.5% of the outstanding  common stock of MainSource  Financial  Group,  Inc., or
approximately  375,000  shares,  through  March  31,  2007.  A copy of the press
release is  attached  as  Exhibit  99.1 to this  Current  Report on Form 8-K and
incorporated by reference herein.


Item 9.01.         Financial Statements and Exhibits

    (c) Exhibits

        99.1              Press Release of MainSource Financial Group, Inc.
                          dated March 31, 2006.


                                   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, thereunto duly authorized.

                                     MAINSOURCE FINANCIAL GROUP, INC.

Date:    March 31, 2006              By:  /s/ James L. Saner, Sr.
                                          -----------------------
                                          James L. Saner, Sr.
                                          President and Chief Executive Officer