O
- Oryema, Geoffrey
- Orzabal, Roland
- Os Mutantes
- Osanna
- Osborne, Jeffrey
- Osborne, Joan
- Osbourne, Ozzy
- Osby, Greg
- Osibisa
- Osmond, Donny
- Osmond, Marie
- Osmonds, The
- Otis, Shuggie
- Ottawan
- Our Lady Peace
- Out Of Focus
- Outkast
- Outlaws (GB)
- Outlaws (USA)
- Outside
- Overkill
- Owens, Buck
- OWL (Of Wondrous Legends)
- Ozric Tentacles