Exhibit 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this registration statement of Middlefield Banc Corp. on Form S-3D of our report dated January 16, 2004, on Middlefield Banc Corp.’s consolidated financial statements appearing in the Annual Report on Form 10-K of Middlefield Banc Corp. for the year ended December 31, 2003, and to the reference to us under the heading “Experts” in the prospectus, which is part of this registration statement.

/s/ S.R. Snodgrass, A.C.

Wexford, Pennsylvania

January 21, 2005