Exhibit 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the following Registration Statements of FirstMerit Corporation and subsidiaries (“FirstMerit”) of our reports dated February 25, 2011, with respect to the consolidated financial statements of FirstMerit and the effectiveness of internal control over financial reporting of FirstMerit, included in this Annual Report (Form 10-K) for the year ended December 31, 2010:

     Form S-8 No. 33-47074

     Form S-8 No. 33-47147

     Form S-8 No. 33-57557

     Form S-8 No. 33-63101

     Form S-8 No. 333-66129

     Form S-8 No. 333-72287

     Form S-8 No. 333-78953

     Form S-8 No. 333-120446

     Form S-8 No. 333-138624

     Form S-8 No. 333-156217

     Form S-3 No. 333-157163

/s/ Ernst & Young LLP Akron, Ohio

February 25, 2011