Sky UK Limited is a British broadcaster and telecommunications company that provides television and broadband Internet services, fixed line and mobile telephone services to consumers and businesses in the United Kingdom. It is a subsidiary of Sky Group and from 2018 onwards, part of Comcast. It is the UK's largest pay-TV broadcaster with 12.7 million customers as of the end of 2019 for its digital satellite TV platform. Sky's flagship products are Sky Q and the internet-based Sky Glass, and its flagship channels are Sky Showcase, Sky Sports and Sky Atlantic.

Formed as British Sky Broadcasting (BSkyB) in November 1990 through the merger of Sky Television and British Satellite Broadcasting, it grew into a major media company by the end of the decade, notably owning all the television broadcasting rights for the Premier League and almost all the domestic rights of Hollywood films. Following BSkyB's acquisition of Sky Italia and a majority interest in Sky Deutschland in 2014, its holding company British Sky Broadcasting Group plc changed its name to Sky plc (now Sky Group Limited). The UK subsidiary's name was changed from British Sky Broadcasting Limited to Sky UK Limited, and continuing to trade as "Sky".

Sky UK Limited is a wholly owned subsidiary of Comcast-owned Sky Group, with its current company directors (including that of Sky Ireland) being Executive Vice-President Stephen van Rooyen and Chief Commercial Officer (CCO) Lyssa McGowen. Its corporate headquarters are at the Sky Studios in Isleworth.