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): June 19, 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 7.01.  Regulation FD Disclosure

On June 19,  2006,  MainSource  Financial  Group,  Inc.  issued a press  release
announcing  the  consummation  of the  acquisition  of  Peoples  Ohio  Financial
Corporation and its wholly owned subsidiary,  Peoples Savings Bank of Troy. With
total assets of  approximately  $200 million,  Peoples Savings Bank operates six
offices in Miami and Montgomery  counties in Ohio. 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) The following exhibit is furnished with this report:

         Exhibit No.       Description

         99.1              MainSource Financial Group, Inc.'s press release
                           dated June 19, 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:    June 19, 2006               By:  /s/ James L. Saner, Sr.
                                          -----------------------
                                          James L. Saner, Sr.
                                          President and Chief Executive Officer