Comcast (CMCSA) 10-K 2009 FY Annual report

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in Registration Statements of Comcast Corporation on Form S-8 (Nos. 333-101645, 333-101295, 333-104385, 333-121082, 333-123059, 333-130844, 333-130845, 333-130847, 333-150976 and 333-161468), Form S-3 (Nos. 333-158816, 333-132750, 333-101861, 333-119161 and 333-104034), and Form S-4 (Nos. 333-101264 and 333-102883) of our reports dated February 23, 2010, relating to the consolidated financial statements and financial statement schedule of Comcast Corporation (which reports express unqualified opinions and include an explanatory paragraph relating to the adoption of new accounting pronouncements in 2009 and 2008), and the effectiveness of Comcast Corporation’s internal control over financial reporting, appearing in the Annual Report on Form 10-K of Comcast Corporation for the year ended December 31, 2009.

/s/ DELOITTE & TOUCHE LLP

Philadelphia, Pennsylvania

February 23, 2010

Comcast 2009 Annual Report on Form 10-K