Exhibit 31.1

				CERTIFICATION



I, Dan R. Carmichael, certify that:

	1. I have reviewed this quarterly report on Form 10-Q/A of Ohio
	   Casualty Corporation;

	2. Based on my knowledge, this report does not contain any untrue
	   statement of a material fact or omit to state a material fact
	   necessary to make the statements made, in light of the circumstances
	   under which such statements were made, not misleading with respect
	   to the period covered by this report;

	3. Based on my knowledge, the financial statements, and other
	   financial information included in this report, fairly present in all
	   material respects the financial condition, results of operations and
	   cash flows of the registrant as of, and for, the periods presented
	   in this report;

	4. The registrant's other certifying officer(s) and I are responsible
	   for establishing and maintaining disclosure controls and procedures
	   (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and
	   internal control over financial reporting (as defined in exchange
	   Act Rules 13a-15(f)) for the Registrant and have:

	     (a) Designed such disclosure controls and procedures, or
		 caused such disclosure controls and procedures to be
		 designed under our supervision, to ensure that
		 material information relating to the registrant,
		 including its consolidated subsidiaries, is made
		 known to us by others within those entities,
		 particularly during the period in which this report
		 is being prepared;

	     (b) Designed such internal control over financial reporting,
		 or caused such internal control over financial reporting
		 to be designed under our supervision, to provide
		 reasonable assurance regarding the reliability of
		 financial reporting and the preparation of financial
		 statements for external purposes in accordance with
		 generally accepted accounting principles;

	     (c) Evaluated the effectiveness of the registrant's
		 disclosure controls and procedures and presented in
		 this report our conclusions about the effectiveness
		 of the disclosure controls and procedures, as of the
		 end of the period covered by this report based on
		 such evaluation; and

	     (d) Disclosed in this report any change in the registrant's
		 internal control over financial reporting that occurred
		 during the registrant's most recent fiscal quarter (the
		 registrant's fourth fiscal quarter in the case of an
		 annual report) that has materially affected, or is
		 reasonably likely to materially affect, the registrant's
		 internal control over financial reporting; and

	5. The registrant's other certifying officer(s) and I have disclosed,
	   based on our most recent evaluation, of internal control over
	   financial reporting, to the registrant's auditors and the audit
	   committee of the registrant's board of directors (or persons
	   performing the equivalent functions):

	     (a) All significant deficiencies and material weaknesses
		 in the design or operation of internal control over
		 financial reporting which are reasonably likely to
		 adversely affect the registrant's ability to record,
		 process, summarize and report financial information; and

	     (b) Any fraud, whether or not material, that involves
		 management or other employees who have a significant role
		 in the registrant's internal control over financial
		 reporting.




Date:  July 20, 2005                      /s/Dan R. Carmichael
					     -------------------------
					     Dan R. Carmichael
					     President and
					     Chief Executive Officer