Consent of Independent Registered Public Accounting Firm Exhibit 23.1

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, and 333-130847), Form S-3 (Nos. 333-132750, 333-101861, 333-119161 and 333-104034), and Form S-4 (Nos. 333-101264 and 333-102883) of our reports dated February 20, 2009, 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 2008 and 2007), 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, 2008.

/s/ DELOITTE & TOUCHE LLP

Philadelphia, Pennsylvania

February 20, 2009

Comcast 2008 Annual Report on Form 10-K 88