Prosperity Bancshares (PB) 10-K 2005 FY Annual report

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in (i) Registration Statements No. 333-78139, 333-92997, 333-100815, 333-110755, 333-123366 and 333-123367 of Prosperity Bancshares, Inc. on Form S-8, (ii) Registration Statement No. 333-93857 of Prosperity Bancshares, Inc. on Form S-3 and (iii) Registration Statements No. 333-106000 and 333-131363 of Prosperity Bancshares, Inc. on Form S-4 of our reports dated March 6, 2006, relating to the consolidated financial statements of Prosperity Bancshares, Inc. and management’s report on the effectiveness of internal control over financial reporting appearing in the Annual Report on Form 10-K of Prosperity Bancshares, Inc. for the year ended December 31, 2005.

/s/ DELOITTE & TOUCHE LLP

Houston, Texas

March 13, 2006