Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Post-Effective Amendment No. 2 to Registration Statement No. 333-191239 on Form S-3 of our reports dated February 27, 2015, relating to the consolidated financial statements and consolidated financial statement schedule of Comcast Corporation 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, 2014, and to the reference to us under the heading “Experts” in the Prospectus, which is part of such Registration Statement.

/s/ DELOITTE & TOUCHE LLP

Philadelphia, Pennsylvania

November 23, 2015