- O
- OO
- OO
- OOak
- OakObe
- ObeObs
- ObsOce
- OceOct
- OctOdd
- OddODE
- ODEOdu
- ODVOff
- OffOG
- OGOh
- OHOhm
- OhmOjo
- OjoOki
- OkiOla
- OlaOld
- OldOle
- OleOli
- OliOlo
- OloOma
- OmaOme
- OmeON
- ONOne
- OneONE
- ONEOne
- OneOnl
- OnlOnu
- OnwOpa
- OpaOph
- OphOR
- OrOrb
- OrbOrc
- OrcOre
- OreOri
- OriOrk
- OrkOrp
- OrpOrs
- Orsory
- OrzOsc
- OscOsl
- OslOst
- OstOti
- OtiOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOxm
- OXOOzo
- OzoOZZ
- Ostrowska, Małgorzata
- Ostura (Lebanese Heavy/Power Metal)
- Ostyn (Project of Bert Ostyn)
- Ostzonensuppenwürfelmachenkrebs
- Osunlade
- Osunlade feat. Divine Essence
- Osunlade feat. Oveous Maximus
- Osvajači (Serbian hard rock/heavy metal band)
- Osvaldo (Los Angeles based beatmaker & producer)
- Osvaldo Ayala
- Osvaldorio (indonesian disc jockey and music producer)
- Oswald (Zouk Singer)
- Oswald, Marianne
- Oswaldir & Carlos Magrão
- Oswalt, Patton
- Oszajca, John
- Oszibarack
- OT (Belgian pop singer Olivia Trappeniers)
- OT7 Quanny
- Otani, Kow (Japanese anime, film & video game composer)
- Ōtani, Tomoya
- Ōtani, Tomoya feat. Kirk-Holmes, Merry
- Ōtani, Tomoya feat. NateWantsToBattle
- Otargos
- Otarion
- otay:onii
- OtC
- OTE
- OTE feat. Ellis, Steven
- Otenki
- Otep
- Otero, Adrián
- Otero, David (00s Spanish musician)
- Otero, David & Adelén
- Otero, David & Basarte, Bely
- Otero, David & Carlos Sadness
- Otero, David & Cepeda
- Otero, David & Fernández, Dani
- Otero, David & Guerra, Ana
- Otero, David & Mäbu
- Otero, David & Soto, Marta
- Otero, David & Taburete
- Otero, David, Nil Moliner & Arnau Griso
- Otero, Manolo
- otetsu feat. GUMI
- Otey, Lisa
- OTF Boonie Moe, Rob49 & Only the Family
- Otgoo
- Otha (Othalie Husøy)
- Othello (Théo Celino)
- other boys
- Other Colors, The
- Other Ego
- Other End, The (Norwegian duo)
- Other Favorites, The
- Other Guys, The (Scottish A Cappella Group)
- Other Guys, The (US hip-hop duo)
- Other Half, The (’60s San Francisco psychedelic rock band)
- Other Lives (US indie rock band)
- Other Men
- Other Minds (Alternative Rock Band)
- Other Ones, The (Australian-German band, hit single "Holiday")
- Other Other Brothers, The
- Other Stars, The (Indie Rock)
- Other Tribe, The
- Other Two, The
- Other Voices (Italian goth)
- Other-ed
- Other, The (horrorpunk band from Germany)
- Other, The (US punk rock band)
- Otherkin
- OTHERLiiNE (George Fitzgerald & Lil Silva)
- Others by No One
- Others, The (UK dubstep producer)
- Others, The (2000s UK rock band)
- Otherview
- Otherwise (US hard rock band)
- Otherwise feat. Costello, Ashley
- Otherwish (Progressive house musician)
- Othila (neofolk / ambient group)
- Othman Wahabi
- Othmane Bali
- Othmer, Julia
- Otierre
- Otik (dance music)
- Otile Brown
- Otilia (Otilia Bruma)
- Otis Junior & Dr Dundiff
- Otis Stacks
- Otis Zola
