O
- Orb, The
- Orbison, Roy
- Orbit, William
- Orbital, The
- Oregon
- Orchestr Bissext
- Orchestr Gustava Broma
- Orchestra Baobab
- Orchid
- Originální pražský synkopický orchestr (OPSO)
- Orioles, The
- Orion
- Orion The Hunter
- Orleans
- Orphaned Land
- Orton, Beth
- Oryema, Geoffrey
- Orzabal, Roland
- Os Mutantes
- Osanna
- Osborne, Jeffrey
- Osborne, Joan
- Osbourne, Ozzy
- Osby, Greg
- Oscar Band
- Osibisa
- Osmond, Donny
- Osmond, Marie
- Osmonds, The
- Ossian