Artists/Bands whose names begin with the "O"
- Ou Est Le Swimming Pool
- Oui 3
- Oui Oui
- Oukast
- Our Lady Peace
- Ours
- Out Of Office
- Out Of Your Mouth
- Out Out
- Outasight
- Outer Order
- Outer Sunset
- Outfield
- Outfly
- Outfly Aka Dynamic
- Outhere Borthers
- Outhere Brothers
- Outkast
- Outlandish
- Outlaw Candy
- Outlawz
- Outloud
- Outsidaz
- Outsiders
- Outsiderz 4 Life
- Outta Control
- Outwork
- OV7
- Ova Steel
- Oval Emotion
- Over It
- Overlords
- Overtones
- Overwhelming Colorfast
- Ovis
- Owen Paul
- Owl
- Owl City
- Owl Eyes
- Owl Vision
- Oxford Collapse
- Oxide And Neutrino
- Oxmo Puccino
- Oxygen
- Oxymorrons
- Ozark Henry
- Ozi
- Ozomatli
- Ozzie
- Ozzy Osbourne
- Orgy
- Orianthi
- Origene
- Origin
- Original
- Original 7ven
- Original Banda El Limon De Salvador Lizarraga
- Original Flavor
- Original Position
- Original Sins
- Originals
- Orinoko
- Orion Too
- Orishas
- Orjan Nilsen
- Orlando
- Orlando Riva Sound
- Orleans
- Orleya
- Orleya Kas
- Oro Solido
- Orphanage
- Orquesta K-Llao
- Orry Jackson
- Orson
- Orson Welk
- Ortis
- Orup
- Oryon
- Osaka Popstar
- Oscar
- Oscar D'Leon
- Oscar G And Ralf Falcon
- Oscar Harris
- Osibisa
- Oskar Lobo
- Osmonds
- Ossian
- OT Quartet
- Otep
- Othello
- Other Ones
- Other Two
- Otherview
- Otherwise
- Otis Redding
- Ottawan
- Otto Knows
- Otway And Barrett
- Otwells
- One The Juggler
- One To One
- One Ton
- One True Voice
- One-Two-Three
- One Way
- Onehundredpercent
- Oneirama
- OnePhatDeeva
- OneRepublic
- Ones
- Onkl P And J9
- Only Child
- Only Ones
- Onyx
- Oobie
- Ookay
- Oomph!
- Oowee
- Opal
- Open
- Open Hand
- Operator
- Operator Please
- Opeth
- Ophelias
- OPM
- Opposites
- Opt5
- Optimo
- Opts
- Opus
- Opus III
- Or-N-More
- Oran Juice Jones
- Orange Avenue
- Orange Blue
- Orange County Supertones
- Orange Juice
- Orb
- Orbital
- Orchestra Jazira
- Orchestral Manoeuvres In The Dark
- Ordinaires
- Ordinary Boys
- Orelsan
- Oren Lavie
- Orezi
- Organ
- Organized Crime Unit