Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the following Registration Statements of Park National

Corporation:

Form S-8 No. 33-92060

Form S-8 No. 333-52653

Form S-8 No. 333-59360

Form S-8 No. 333-59378

Form S-8 No. 333-91178

Form S-8 No. 333-168334

Form S-8 No. 333-188323

Form S-3 No. 333-181515

of our report dated February 24, 2015, relating to the consolidated financial statements and effectiveness

of internal control over financial reporting, appearing in this Annual Report on Form 10-K.

Crowe Horwath LLP

Columbus, Ohio

February 24, 2015