Exhibit 23(c)
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in this Registration Statement on Form S-3 of our
reports dated February 25, 2008, relating to the consolidated financial statements of Huntington Bancshares
Incorporated (which report expresses an unqualified opinion and includes an explanatory paragraph
related to the adoption of Statement of Financial Accounting Standards (SFAS) No. 123(R),
Share-Based Payment, SFAS No. 156, Accounting for Servicing of Financial Assets, and SFAS No. 158,
Employers Accounting for Defined Benefit Pension and Other Postretirement Plans, in 2006), and the
effectiveness of Huntington Bancshares Incorporateds internal control over financial reporting,
incorporated by reference in the Annual Report on Form 10-K of Huntington Bancshares Incorporated
for the year ended December 31, 2007, and to the reference to us under the heading Experts in the
Prospectus, which is part of this Registration Statement.
/s/ Deloitte & Touche LLP
Columbus, Ohio
January 12, 2009