- O.A.R. (OF A REVOLUTION)
- Oak Ridge Boys
- Oasis
- Obie Trice
- Obituary
- OBK
- Obsession Indecent
- Ocean Blue
- Ocean Colour Scene
- Oceans Of Sadness
- October 31
- Odious
- Offspring
- Ohio Express
- Oil Midnight
- Oingo Boingo
- OK Go
- Ol Dirty Bastard
- Old
- Old Mans Child
- Oldfield Mike
- Oleander
- Oli P
- Oliver Dragojevic
- Olivia Newton-John
- Olsen Twins
- OMD
- On Thorns I Lay
- One Dove
- One Minute Silence
- ONE RING musical
- Onslaught
- Onward
- Oomph
- Operation Ivy
- Ophthalamia
- Option 1
- Orange Goblin
- Orchestral Manoeuvres In The Dark
- Oreja De Van Gogh, La
- Organized Konfusion
- Orgy
- Original Broadway Cast
- Originoo Gunn Clapazz
- Orphanage
- Orphaned Land
- Os Paralamas Do Sucesso
- Ossian
- OTIS REDDING
- Our Lady Peace
- OutKast
- Outlandish
- Outlaws
- Ov7
- Overdrive Bachman-Turner
- Ozark Mountain Daredevils
- Ozma
- Ozzy Osbourne