U
| Undeniable | Heavy/Thrash Metal | Сливен/Лос Анжелис (САЩ) | 2019 |
| Unhumanity | Death Metal | Пловдив | 2008 |
| Uninie | Black Metal | София | 2022 |
| Uninvited | Power Metal | Русе | 2019 |
| Unrest | Grindcore/Crust | Варна | 2007 |
| Upyr | Doom Metal | София | 2012 |
| Urban Grey | Thrash Metal/Crossover/Hardcore | София | 2000 |