- O
- OO
- OO
- OOak
- OakObi
- ObiObs
- ObsOce
- OceOct
- OctOdd
- OddOde
- OdeOef
- OehOff
- OffOgd
- OgdOh
- OhOi
- OiOk
- okOku
- OkuOld
- OldOld
- OldOli
- OliOli
- OliOls
- OlsOMB
- OMBOmn
- OmnO
- OnaOne
- OneOne
- OneOng
- OngOno
- OnoOom
- OomOpe
- OpeOpt
- optOra
- OraOrc
- OrcOrd
- OrdOrh
- OrhOri
- OriOrm
- OrmOrq
- OrqOrt
- OrtOsb
- OsbOsi
- OsiOst
- OstOth
- OthOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOxl
- OxlOzm
- OZMOZZ
- Ostbahn-Kurti & die Chefpartie
- Ostbahn-Kurti & die Chefpartie mit Brühl, Elisabeth von
- Ostbahn, Kurt
- Ostbahn, Kurt & Kombo, die
- Ostbahn, Kurt & Ostbahn 11, Die
- Östblocket
- Ostblockschlampen
- Osted
- OsTEKKe
- Östen med Resten
- Oster Lapwass
- OSTER project
- Ostermann, Willi
- österreich
- Ostertag, Florian
- Osterwald, Hazy (Swiss musician, singer and bandleader)
- Osterwald, Hazy, Sextett
- Ostinato (Jazzband)
- Ostkreutz
- OSTON
- ostooandell
- Ostoura, Hamo El
- Ostrar, Adam
- Ostrogoth (Belgian metal band)
- 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
- 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)
