Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

The Board of Directors
Century Bancorp, Inc.:

We consent to the incorporation by reference in the registration statement on Form S-8 of Century Bancorp, Inc. of our reports dated February 27, 2006, with respect to the consolidated balance sheets of Century Bancorp, Inc. and subsidiary as of December 31, 2005 and 2004, and the related consolidated statements of income, changes in stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2005, management’s assessment of the effectiveness of internal control over financial reporting as of December 31, 2005 and the effectiveness of internal control over financial reporting as of December 31, 2005, which reports appear in the December 31, 2005 Annual Report on Form 10-K of Century Bancorp, Inc.

Boston, Massachusetts
March 14, 2006