- Unison Square Guarden
- Unisonic
- Unit 56
- Unit Five
- Unit Four Plus Two
- Unite The Faith
- United Grace
- United Live
- United Pursuit
- United Pursuit Band
- Unitopia
- Universe
- Universum
- Unjoy
- Unkle
- Unkle Bob
- Unknown
- Unknown Hinson
- Unknown Mortal Orchestra
- Unknown World
- Unkutt
- Unleash The Archers
- Unleash The Sky
- Unleashed
- Unleashed From The Machinery
- Unlimits
- Unloco
- Unlord
- Unmerciful
- Unmercyful
- Unmoored
- Unnatural Helpers
- Unni Wilhelmsen
- Uno Hoo
- Uno Menos
- Uno Svenningson
- Uno Svenningsson
- Uno Y Otro
- Unos Panas Ahi
- Unpaid Debt
- Unplugged
- Unpoc
- Unravel
- Unrest
- Unsane
- Unseen
- Unspoken
- Unsraw
- Unstabld
- Unsun