- Uncle Jed
- Uncle Jumbo
- Uncle Kracker
- Uncle Kracker feat. Gray, Dobie
- Uncle Kracker feat. Kid Rock & Paradime
- Uncle Kracker feat. Lee, Jesse
- Uncle Lucius
- Uncle Luke
- Uncle Mega (French rapper)
- Uncle Moishy
- Uncle Murda
- Uncle Murda feat. Jadakiss, Benny the Butcher & Que Banz
- 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
- Unclubbed with Cavendish, Bess
- Uncluded, The (Aesop Rock & Kimya Dawson)
- Unco (Venezuela rock band)
- Uncommon Nasa (US rapper Paul Loverro, a.k.a. Nasa)
- Uncommonmenfrommars
- Unconditional
- uncoolclub
- Uncured
- Uncut (Canadian indie rock band)
- Und Bodevan
- Und wieder Oktober (Melancholic pop group from Cologne, Germany)
- Unda Surveillance
- UNDADASEA
- Undawn
- Undead (UK punk band)
- Undead (US Thrash/Death Metal)
- 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
- Undenyable
- Under (San Francisco downtempo band)
- Under (Rock band from New Zealand / Australia / Hong Kong)
- Under Black Helmet (techno producer)
- Under Byen (Danish band)
- Under Delusion
- Under Eden
- Under Electric Light
- Under Moonlight Sadness
- Under the Black Shores (Deathcore from Paris, France)
- Under the Church (death metal)
- Under the Flood
- Under the Gallows (UtG)
- Under the Influence
- Under the Influence of Giants
- Under the Mountain
- 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)
- Underberg, Andrew
- Underberg, Andrew, Haft, Sam, David, Keith & Roman, Blake
- Undercast (Undercast is an alternative rock band based in Sydney, Australia.)
- Undercatt
- Undercover (UK dance group)
- Undercover (SoCal rock band)
- UnderCover (Psytrance; Adam Belo & Almog Shmuel)
- Undercover Agency
- Undercover Agent & Kriminal, The
- Undercover Brothers Ug (Uganda)
- Undercover Hippy, The
- 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
- Underdown, Jon
- Underfish
- Underfound
