Three UK
| Three UK | |
| Company type | Limited company |
| Industry | Telecommunications |
| Founded | 3 March 2003 |
| Founder | Hutchison Whampoa |
| Headquarters | Reading, England |
Number of locations | 293 stores |
Area served | United Kingdom |
Key people | Max Taylor (CEO) |
| Products | |
| Brands | SMARTY |
| Services | Broadband and Mobile |
| Revenue | £2,590 million (FY 2023) |
Number of employees | 4,800 |
| Parent | VodafoneThree |
| Website | www |
Hutchison 3G UK Limited, trading as Three UK, is a British telecommunications company based in Reading, England. It is a wholly owned subsidiary of VodafoneThree, a joint venture between Vodafone (51%) and CK Hutchison Holdings (49%). It is the smallest of the four mobile network operators in the United Kingdom, with about 10.9 million subscribers as of November 2024, behind fellow VodafoneThree subsidiary Vodafone UK.
The company was launched on 3 March 2003 as the UK's first commercial 100% 3G network. It provides 4G and 5G services through its own network infrastructure. In June 2023, it was proposed that Three would merge with Vodafone UK. The merger was approved by the Competition and Markets Authority in December 2024 and completed in June 2025.