- O-Town
- Obliveon
- Obsession Indecent
- Obsidian Gate
- Ocean Blue
- Oceans Of Sadness
- Odds
- Odes Of Ecstasy
- Offspring
- Oficina G3
- Oil Midnight
- Old Dead Tree
- Old Mans Child
- Oliver Dragojevic
- Oliver! Soundtrack
- Olivia Newton-John
- Olsen Twins
- OMD
- Omen
- One Voice
- Onyx
- Oomph
- Oora
- Operation Ivy
- Opeth
- Ophthalamia
- Orange 9mm
- Orchestral Manoeuvres In The Dark
- Order New
- Ordo Equilibrio
- Orishas
- Orleans
- Orton Beth
- Os Paralamas Do Sucesso
- Osbourne Ozzy
- Osdorp Posse
- Osker
- Osmond Donny
- Otyg
- Our Lady Peace
- Outfield
- OUTKAST
- Outlawz
- Over The Rhine
- Overbass
- Overkill
- Oxide & Neutrino
- Ozark Mountain Daredevils
- Ozzy Osbourne