- Oar
- Oasis
- Obituary
- Obsidian Gate
- Octavia
- Odds
- Odetta
- Offspring
- Ol Dirty Bastard
- Old
- Olivia Newton-John
- Omd
- Omul Cu Sobolani
- One Dollar Short
- Opera Ix
- Opeth
- Opuestos Sentidos
- Oratory
- Orff Carl
- Original Broadway Cast
- Original Naabtal Duo
- Orishas
- Orton Beth
- Ossian
- Otep
- Our Lady Peace
- Ours
- Out Of Season
- Outfield
- OutKast
- Ov7
- Overkill
- Ozark Mountain Daredevils
- Ozzy Osbourne