- Uncle Kracker feat. Kid Rock & Paradime
- Uncle Kracker feat. Lee, Jesse
- Uncle Lucius
- Uncle Luke
- Uncle Murda
- Uncle Murda feat. Que Banz
- Uncle Sam (US R&B singer, key track "I Don't Ever Want To See You Again")
- Uncle Sinner
- Uncle Slam
- Uncle Tupelo
- Uncle Vic
- Uncle Waffles
- Unclubbed
- Unclubbed feat. Durrant, Zoe
- Unclubbed with Bailey, Abigail
- Uncluded, The (Aesop Rock & Kimya Dawson)
- Unco (Venezuela rock band)
- Uncommon Nasa (US rapper Paul Loverro, a.k.a. Nasa)
- Uncommonmenfrommars
- Unconditional
- uncoolclub
- Uncut (Canadian indie rock band)
- Und wieder Oktober (Melancholic pop group from Cologne, Germany)
- Unda Surveillance
- Undawn
- Undead (UK punk band)
- UNDEAD CORPORATION
- Undead Prophecies (death metal)
- Undead, The (USA punk band from New Jersey, vocalist Bobby Steele)
- Undead, The (fictional artists, Phantom of the Paradise, 1974)
- Undeath
- Undecided, The
- Undecimber (gothic metal)
- Undeclinable
- Undeclinable Ambuscade
- Under (San Francisco downtempo band)
- Under (Rock band from New Zealand / Australia / Hong Kong)
- Under Black Clouds
- Under Black Helmet (techno producer)
- Under Byen (Danish band)
- Under Eden
- Under Electric Light
- Under the Black Shores (Deathcore from Paris, France)
- Under the Church (death metal)
- Under the Flood
- Under the Influence
- Under the Influence of Giants
- Under the Oak (US folk artist from Philadelphia, PA)
- Under the Pledge of Secrecy
- Under The Rug
- Under the Symphony (Argentinian rock band)
- Under Their Church
- Under Two Flags
- Underachievers, The (US rap group)
- Underachievers, The (hardcore punk)
- Undercast (Undercast is an alternative rock band based in Sydney, Australia.)
- Undercover (UK dance group)
- Undercover (SoCal rock band)
- UnderCover (Psytrance; Adam Belo & Almog Shmuel)
- Undercover Agency
- Undercover Brothers Ug (Uganda)
- Undercover Hippy, The
- Undercover Slut
- Undercroft (Chilean death metal band)
- Underdog (New York hardcore group)
- Underdog Project, The (German-Belgian dance group)
- Underdog Project, The feat. Sunclub, The
- Underdog Project, The vs. Sunclub, The
- Underdogs, The (60s Motown soul/psychedelic group)
- Underdown, Jon
- Underfish
- Underfound
- Undergang (Danish death metal)
- Undergång (Swedish crossover band)
- Undergods, The (Canibus & Keith Murray)
- Undergods, The feat. Tech N9ne
- Underground Dance Artists United for Life
- Underground Kingz feat. Kool Ace & Too Short
- Underground Lovers
- Underground Resistance (Detroit techno)
- Underground Sound of Lisbon
- Underground Sound Society, The
- Underground Youth, The
- Underground, Glenn
- Undergrunn (Norwegian hip hop group)
- Underhill, Adrian
- Underhill, Emily
- Underlined (industrial metal)
- Underminded
- Undermine
