O
- Ochs, Phil
- Oi Oi Hubert Macháně
- Oi Polloi
- Oingo Boingo
- OK Band
- Ol´ Dirty Bastard
- Old Teenagers
- Oldfield, Mike
- Oldland, Michéle "Misty"
- Ole Lukkoye
- Oliver Onions
- Olivia Tremor Control
- Olomidé, Koffi
- Olympic
- OM
- OMD
- Omega
- Omnibus
- One Way System
- Only Living Witness
- Only Ones, The
- Onyx
- Operation Ivy
- Opeth
- OPM
- OPN
- Optima
- Opus
- Opus lll
- Orange Goblin