Comcast (CMCSA) 8-K/A Independent auditor’s report to Sky plc

Exhibit 23.1

CONSENT OF INDEPENDENT AUDITORS

We consent to the incorporation by reference in Registration Statements of Comcast Corporation onForm S-3(No. 333-212719) andForm S-8(Nos. 333-101295,333-101645,333-104385,333-121082,333-123059,333-130844,333-130845,333-130847,333-150976,333-161468,333-174416,333-174417,333-179638,333-183008,333-193903,333-210085,333-212716,333-224456, and333-224455) of our report dated 18 December 2018 relating to the financial statements of Sky plc as of and for the year ended 30 June 2018 (which report expresses a qualified opinion relating to the lack of presentation of comparative information for the preceding period and includes anemphasis-of-matter paragraph relating to the use of a basis of accounting different from accounting principles generally accepted in the United States of America), appearing in this Current Report onForm 8-K.

/s/ DELOITTE LLP

London, United Kingdom

18 December 2018