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- Ornatos Violeta
- Ornella Vanoni
- Orodruin
- Orphanage
- Orphaned Land
- Orquesta Guayacan
- Orquesta La Palabra
- Orrin Tucker
- Orso
- Ortega
- Orthodox
- Orup
- Os Morenos
- Os Mutantes
- Os Paralamas Do Sucesso
- Os Replicantes
- Os Thompsons
- Os Travessos
- Os Vigaristas
- Osakana Penguin
- Osbourne Family Album soundtrack
- Oscar Brand
- Oscar D'Leon
- Oscar De La Hoya
- Oscar Medina
- Oscar Rose
- Oschino
- Osdorp Posse
- Ose
- OSI
- Oskar Schima
- Ossastorium
- Ostara
- Ostava
- Osvaldo Chacon
- OSW (Petos, Jodarok, Seyed Ali, Raimo)
- Otep
- Other People
- Otherwise Orange
- Othman Hamzah
- Othorized F.A.M.
- Otierre
- Otis Redding
- Otispunk
- Ottawan
- Otto Ohm
- Otto Walkes
- Our Daughters Wedding
- Our Dying Moment
- Our Emotional Trinkets
- Our Final Say
- Our Finest Hour
- Our Hearts Hero
- Our Lady Peace
- Our Last Night
- Our Little Corner of the World: Music From Gilmore Girls soundtrack
- Ours
- Out Cold soundtrack
- Out Hud
- Out Of Eden
- Out Of Hand
- Out Of Options
- Out Of The Grey
- Out Of The Ordinary
- Out Of Your Mouth
- Out To Win
- Outblast
- Outbreak
- OUTERSPACE
- Outkast
- Outlandish
- Outlasting The Crowd
- Outlawz
- Outlet
- Outline
- Outnumbered
- Outshined
- Outside Providence soundtrack
- Outside Royalty
- Outtareach
- Ova Looven
- Oval Opus
- Ove Stoylen
- Over Estimated
- Over It
- Over My Dead Body
- Over The Hedge Soundtrack
- Over The Line
- Over the Rhine
- Overdose