EXHIBIT 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the following Registration Statements:

(1) Registration Statement (Form S-8 No. 333-182467) pertaining to the Park-Ohio Holdings Corp. Amended and Restated 1998 Long-Term Incentive Plan,

(2) Registration Statement (Form S-8 No. 333-01047) pertaining to the Individual Account Retirement Plan,

(3) Registration Statement (Form S-8 No. 333-58161) pertaining to the Park-Ohio Holdings Corp. Amended and Restated 1998 Long-Term Incentive Plan,

(4) Registration Statement (Form S-8 No. 333-110536) pertaining to the Park-Ohio Holdings Corp. Amended and Restated 1998 Long-Term Incentive Plan,

(5) Registration Statement (Form S-8 No. 333-137540) pertaining to the Park-Ohio Holdings Corp. Amended and Restated 1998 Long-Term Incentive Plan and

(6) Registration Statement (Form S-8 No. 333-161474) pertaining to the Park-Ohio Holdings Corp. Amended and Restated 1998 Long-Term Incentive Plan,

of our reports dated March 15, 2013, with respect to the consolidated financial statements and schedule of Park-Ohio Holdings Corp. and the effectiveness of internal control over financial reporting of Park-Ohio Holdings Corp., included in this Annual Report (Form 10-K) for the year ended December 31, 2012.

/s/ ERNST & YOUNG LLP

Cleveland, Ohio

March 15, 2013