- O
- OO
- OO
- OOak
- OakObe
- Obs
- ObsOce
- OceOck
- OckOcu
- OcuODE
- OdeOdo
- OdoOfe
- OfeOff
- OffO
- OGXOHE
- OhGOJ
- OJOka
- OkaOl
- OlOld
- OldOle
- OleOli
- OliOli
- OliOLU
- OluOmb
- OmbOmn
- OmnOna
- OOne
- OneOne
- OneONE
- ONEOnl
- Onlooi
- OoiOpe
- OpeOpp
- OppOra
- OraOrb
- OrbOrc
- OrdOrg
- OrgOri
- OriOrl
- OrlOrp
- OrpOrt
- OrtOs
- OsOsc
- OscOsm
- OsmOT
- OTOtr
- OtrOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOvi
- OviOwe
- OweOxo
- OxoOzr
- OZROZZ
- 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 (Alternative rock/post-grunge band from Phoenix, Arizona.)
- Otis (Mozambican saxophone player)
- Otis Junior & Dr Dundiff
- Otis Stacks
- Otis Zola
- Otis, Johnny
- Otis, Johnny, Show, The
- Otis, Shuggie
- Otlo
- Otnicka (Electronic Musician)
- Oto
- oto (Pascal Hubert, Farid Dahalb & François Rousseau)
- Otoboke Beaver
- Otomo, Yoshihide
- OTR (Downtempo electronic producer)
- OTR & Au/Ra
- OTR & Bipolar Sunshine
- OTR & Panama
- OTR & Rory Wynne
- Otra Cara de la Nada, La
- Otra Fe, La
