| Band | Formed / started | Split up / ended | Note |
|---|---|---|---|
| U.K. | December 1977 | December 1979 | — |
| UB40 | 1978 | — | — |
| UFO | 1969 | — | British space rock/hard rock band |
| UK Decay | 1978 | December 1982 | — |
| UK Subs | 1977 | — | English punk band |
| Ulrika Spacek | 2014 | — | — |
| Ultimate Painting | 2014 | 2018 | — |
| Ultramarine | 1989 | — | electronic duo Ian Cooper & Paul Hammond |
| Ultrasound | 1996 | — | — |
| Ultravox | 1976 | — | — |
| Ultraxine | 29 December 2003 | — | — |
| Ultraísta | 2008 | — | — |
| Umbrella Assassins | 30 September 2006 | — | — |
| Uncle Acid & The Deadbeats | 2009 | — | — |
| Uncoffined | 2011 | — | — |
| Under the Ashes | 2022 | — | — |
| Underdark | 2015 | — | — |
| Unfathomable Ruination | 2010 | — | — |
| Unicorn | 1971 | — | — |
| Unit 4+2 | 1963 | 1967 | — |
| UNKLE | 1994 | — | — |
| Unpeople | 2023 | — | — |
| Urban Dogs | 1982 | — | — |
| Urchin | 1971 | 1980 | NWOBHM |
| Uriah Heep | 1970 | — | British prog/hard rock |
| Us3 | 1991 | — | — |