- Unholy (Finnish doom metal)
- Unholy Desecration
- Unholy Ghost
- Unholy Grave
- Unholy Impurity
- Unholy Matrimony
- Unholy Modal Rounders
- Unholy Quest
- Uni (New York glam rock band)
- UNI (Sacramento Hardcore)
- UNI and the Urchins
- Uni Boys
- Uni Debess
- Uni Poska (Ska Punk Italian band)
- UNI-Qreatives feat. aimi
- UNI.T
- Uniatowski
- Uniatowski, Sławek
- Única Vagancia, La
- Unicante (a cappella choir of the student service organization Göttingen)
- UniChØrd (D4DJ)
- Unico (Tallahassee, FL bog metal band)
- UNICORN (Japanese rock band)
- Unicorn (1970s UK rock band)
- Unicorn Academy
- Unicorn Heads
- Unicorn Hole
- Unicorn Kid
- Unicorn Kid feat. Talk to Animals
- Unicorn on Ketamine
- Unicornibot
- Unicorns Killed My Girlfriend
- Unicorns, The
- Unicq
- Unida (stoner rock group)
- Unidad Alavesa
- Unidad Trauma
- UNIDARK (UK extreme metal producer and creator of Blackdeathgrin Metal)
- Unifaun
- Unifics, The (soul group)
- Unified Highway
- Unified Theory (ex-Blind Melon and ex-Pearl Jam alternative rock super group)
- Unifier
- Unifire
- Uniform (industrial/noise rock duo from New York City)
- Uniform Motion
- Uniforms (Spanish dream pop band)
- Unify Separate (Swedish duo featuring Geneva frontman Andrew Montgomery)
- Uniikki
- Uniikki feat. Andu & Tasis
- Uniikki feat. Cheek
- Uniikki feat. Elastinen
- Uniikki feat. Elastinen & Spekti
- Uniikki feat. Hookki-Heikk1 & Mikael Gabriel
- Uniikki feat. Huovila, Mia
- Uniikki feat. Ike
- Uniikki feat. Illi
- Uniikki feat. Iso H
- Uniikki feat. Pääkallo, Jimi
- Uniikki feat. Timo Pieni Huijaus
- UNIIQU3
- UNIIQU3 & Manual, Ase
- UNIKID feat. Deisy
- Unikkatil
- Uniklubi
- Unimagined
- Uninvited (Scottish band)
- Uninvited Guest
- Uninvited, The (Los Angeles alternative rock band)
- Union (US hard rock supergroup, active late 1990s–early 2000s)
- Union (hip‐hop group from Paris, France)
- Union (Rock, Canada)
- Union 13
- Union Avenue (Scottish country‐rockabilly band)
- Union Blak (UK hip-hop group)
- Union Carbide Productions (Swedish garage punk band)
- Union Cinema
- Union du son
- Union J
- Union Jack (UK trance group)
- Union Jack (French punk band)
- Union of Knives (Scottish electronic rock band)
- Union of Sinners, The & Saints
- Union Of Sound
- Union of Uranus
- Union Rails (Finnish rock group)
- Union Square
- Union Turnpike
- Union Underground, The
- Union Wireless
