Sky UK (formerly British Sky Broadcasting Limited, BSkyB and Sky) is a telecommunications company which serves the United Kingdom. Sky provides television and broadband Internet services, fixed line and mobile telephone services to consumers and businesses in the United Kingdom. It is the UK's largest pay-TV broadcaster with 11 million customers as of 2015. It was the UK's most popular digital TV service until it was overtaken by Freeview in April 2007. Its corporate headquarters are in Isleworth.

Formed in March 1994 four years after the merger of Sky Television and British Satellite Broadcasting, Sky became the UK's largest digital subscription television company. Following Sky's 2014 acquisition of Sky Italia and a majority 90.04% interest in Sky Deutschland in November 2014, its holding company British Sky Broadcasting Group plc changed its name to Sky plc. The UK subsidiary's name was changed from British Sky Broadcasting Limited to Sky UK Limited, and continues to trade as Sky as of November 2018.

Sky UK Limited is a wholly owned subsidiary of Comcast-owned Sky, with its current company directors being Andrew Griffith and Christopher Taylor. Griffith acts as the Chief Financial Officer (CFO) and the Managing Director for the commercial businesses division.