EXHIBIT 32.1

                                  CERTIFICATION

I, Dan R. Carmichael, President and Chief Executive Officer of Ohio Casualty
Corporation (the "Company"), certify, pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that:

      1.    The Annual Report on Form 10-K (or Form 10-KSB) of the Company for
            the annual period ended December 31, 2005 (the "Report") fully
            complies with the requirements of Section 13(a) of the Securities;
            Exchange Act of 1934 (15 U.S.C. 78m); and

      2.    The information contained in the Report fairly presents, in all
            material respects, the financial condition and result of operations
            of the Company.

A signed original of this written statement required by Section 906 has been
provided to the Company and will be retained by the Company and furnished to the
Securities and Exchange Commission or its staff upon request.

Dated: March 7, 2006               /s/ Dan R. Carmichael
                                   ---------------------------------------------
                                   Name:  Dan R. Carmichael
                                   Title:  President and Chief Executive Officer