Consent of Independent Registered Public Accounting Firm Exhibit 23.1

We consent to the incorporation by reference in Registration Statements on Form S-8 (Nos. 333-101645, 333-101295, 333-104385, 333-121082, 333-123059, 333-130844, 333-130845, 333-130847, 333-150976, 333-161468, 333-174416, 333-174417, 333-179638, and 333-183008) and Form S-3 (No. 333-179678) of our reports dated February 20, 2013, relating to the consolidated financial statements and financial statement schedule of Comcast Corporation, and the effectiveness of Comcast Corporation’s internal control over financial reporting, appearing in this Annual Report on Form 10-K of Comcast Corporation for the year ended December 31, 2012.

/S/ DELOITTE & TOUCHE LLP

Philadelphia, Pennsylvania

February 20, 2013

1 Comcast 2012 Annual Report on Form 10-K