EXHIBIT 32.1

                            CERTIFICATION PURSUANT TO
                   TITLE 18, UNITED STATES CODE, SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

      In connection with the Annual Report of Ohio Casualty Corporation (the
"Company") on Form 10-K for the fiscal period ended December 31, 2004 as filed
with the Securities and Exchange Commission on the date hereof (the "Report"),
I, Dan R. Carmichael, Chief Executive Officer of the Company, certify, pursuant
to Title 18, United States Code, Section 1350, as adopted pursuant to Section
906 of the Sarbanes-Oxley Act of 2002, that:

                  (1)   The Report fully complies with the requirements of
Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

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

It is not intended that this statement be deemed to be filed for purposes of the
Securities Exchange Act of 1934.

                                           /s/ Dan R. Carmichael
                                           ---------------------
                                           Dan R. Carmichael
                                           President and Chief Executive Officer
                                           March 11, 2005