- Unhuman (Canadian death metal band)
- UNI and the Urchins
- UNI.T
- UniChØrd (D4DJ)
- Unico (Tallahassee, FL bog metal band)
- UNICORN (Japanese rock band)
- Unicorn (’70s rock group, UK)
- Unicorn Academy
- Unicorn Heads
- Unicorn Kid
- Unicorn Kid feat. Talk to Animals
- Unicorn on Ketamine
- Unicorns, The
- Unicq
- Unida
- Unidad Alavesa
- Unidad Trauma
- 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 Choice
- Uniform Motion
- Uniforms (Spanish dream pop band)
- Unify Separate (Swedish duo featuring Geneva frontman Andrew Montgomery)
- Uniikki
- Uniikki feat. Cheek
- Uniikki feat. Elastinen & Spekti
- Uniikki feat. Iso H
- UNIIQU3
- Uniklubi
- Uninvited (Scottish band)
- Uninvited, The (alternative rock band from LA)
- 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 Carbide Productions (Swedish garage punk band)
- Union Duke (Toronto, ONT, Canada)
- Union J
- Union Jack (UK trance group)
- Union of Knives (Scottish electronic rock band)
- Union of Sinners, The & Saints
- Union of Uranus
- Union Square
- Union Turnpike
- Union Underground, The
- Union Youth
- Union, Beat
- Unión, La
- Union, The (Gospel & Soul group)
- Union, The (UK rock band)
- Uniones (Argentinean post-hardcore band)
- UNIONS (japanese band)
- Unions (indie duo?)
- UNIQ (Chinese-South Korean group)
- uniqlesse
- Uniqo
- Uniqplan
- Unique (Hungarian synth-pop, electro-pop group)
- Unique 3 (UK Bleep/Techno/Bass pioneers)
- Unique II
- Unique, Dominique Young
- Uniquegodx
- Uniques, The (Jamaican rocksteady vocal trio)
- Uniques, The (late 1960s US garage rock/R&B band from Louisiana)
- Uniques, The (Slovak band - changed name to Nvmeri after 2013)
- UNIS (South Korean girl group)
- Unisex, The
- Unison (Young producer of EDM born in Switzerland)
- UNISON SQUARE GARDEN
- Unisonic
- UniSono (University Choir of Paderborn)
- UNIST
- Unit (Bolivian Group)
- Unit 4+2
- Unit 406
- UNIT BLACK
- Unit Five (Norwegian pop band)
- Unit Gloria (Dutch 60's and 70's pop group)
- Unit Wail
- Unit, The
- Unit, Vortex
- Unit:187
- Unitaskers, The (Milwaukee indie rock)
- Unite (Danish boyband)