128 O artists
- O Rappa
- O'Ryan
- O-town
- O-zone
- O.A.R.
- O.C.
- O.L.D.
- Oasis
- Obie Bermúdez
- Obie Bermudez
- Obie Trice
- Obituary
- OBK
- Oblivion Dust
- Obtained Enslavement
- Ocean Colour Scene
- Oceans Of Sadness
- Oceansize
- Octavia
- October Project
- Odd Nordstoga
- Odd Project
- Odds
- Odes Of Ecstasy
- Odyssey
- Off Broadway
- Officer Negative
- Offspring
- Ofra Haza
- Ogie Alcasid
- Oi Polloi
- Oingo Boingo
- Ok Go
- Ol' Dirty Bastard
- Old 97's
- Old Man's Child
- Oleander
- Oleta Adams
- Olga Tañón
- Olive
- Olivia
- Olivia Newton-John
- Omarion
- Omd
- Omen
- Omnisoul
- Omnium Gatherum
- Omul Cu ÅŸobolani
- On Broken Wings
- On Thorns I Lay
- Once Blue
- One 2 Many
- One Dollar Short
- One Man Army
- One Minute Silence
- One More Time
- One True Thing
- One Voice
- One-21
- Onelinedrawing
- OneSideZero
- Only Living Witness
- Onslaught
- Onward
- Onyx
- OOMPH!
- Open Hand
- Open Skyz
- Opera IX
- Operation Ivy
- Opeth
- Opgezwolle
- Ophelie Winter
- Ophthalamia
- OPM
- Opus
- Opus III
- Orange 9MM
- Orange Blue
- Orange Goblin
- Oratorio
- Oratory
- Orbit
- Orchid
- Ordinary Boys
- Ordo Equilibrio
- Ordo Rosarius Equilibrio
- Organized Konfusion
- Orgy
- Origin
- Originoo Gunn Clapazz
- Orishas
- Ornatos Violeta
- Orphanage
- Orphaned Land
- Os Mutantes
- Os Paralamas Do Sucesso
- Osdorp Posse
- Osker
- Ossian
- OST
- Otep
- Otis Redding
- Otyg
- Our Lady Peace
- Ours
- Out Of Eden
- Out Of Your Mouth
- Outfield
- Outkast
- Outlandish
- Outlawz
- Outsidaz
- OV7
- Over It
- Overcast
- Overcome
- Overflow
- Overhead
- Overkill
- Owen
- Oxide & Neutrino
- Oxiplegatz
- Oxymoron
- Ozark Henry
- Ozma
- Ozomatli
- Ozzy Osbourne