- O
- OO
- OO
- OOak
- OakObe
- ObeObs
- ObsOce
- OceOct
- OctOdd
- OddODE
- ODEOdu
- ODVOff
- OffOG
- OGOh
- OHOhm
- OhmOjo
- OjoOki
- OkiOla
- OlaOld
- OldOle
- OleOli
- OliOlo
- OloOma
- OmaOme
- OmeON
- ONOne
- OneONE
- ONEOne
- OneOnl
- OnlOnu
- OnwOpa
- OpaOph
- OphOR
- OrOrb
- OrbOrc
- OrcOre
- OreOri
- OriOrk
- OrkOrp
- OrpOrs
- Orsory
- OrzOsc
- OscOsl
- OslOst
- OstOti
- OtiOtt
- OttOur
- OurOut
- OutOut
- OutOve
- OveOve
- OveOwe
- OweOxm
- OXOOzo
- OzoOZZ
- Old Sepultura
- Old Settlers
- Old Silver Key
- Old Smokey
- Old Soul Rebel
- Old Stove
- Old Time Radio
- Old Time Relijun
- Old Town School of Folk Music
- Old Town Trio
- Old Wave
- Old Wharf (Metalcore/Beatdown band from Wolverhampton, UK.)
- Old Wharf ft Hounslow, Daniel
- Old Wounds (New Jersey hardcore band)
- Old, Jase
- Oldarra
- Oldblood (Blackened Doom/Post from UK)
- OLDCODEX
- Olde Throne
- Oldelaf
- Oldelaf et Monsieur D.
- Olden, Lise
- Oldest Sea
- Oldfield, Mike
- Oldfield, Mike & Anderson, Jon
- Oldfield, Mike feat. Chapman, Roger
- Oldfield, Mike feat. Westenra, Hayley
- Oldfield, Mike with Anderson, Jon
- Oldfield, Sally
- Oldfield, Sally feat. Oldfield, Mike
- Oldfield, Terry
- Oldfield, Terry & Garo, Carlos
- Oldfield, Terry & Saraswati, Soraya
- Oldfield, Wendy
- Oldham Tinkers, The
- Oldham, Andrew, Orchestra, The
- Oldham, Will
- Oldhead
- Oldians, The (ska jazz band from Barcelona, Spain)
- OldPee (13 Block)
- Olds, Jerome
- Oldsoul
- Oldu O Zaman
- Ole 60
- Ole Erling
- Ole I'Dole
- Ole Ivars
- Olé Olé
- Olé Olé con Diges, Daniel
- Olé Olé con Materia Prima
- Olé Olé Con Modestia Aparte
- Olé Olé Con Norte, El, Segura, Santiago, Modestia Aparte, Antonio Albella Y Pingüino en mi ascensor, Un
- Olé Olé con San Basilio, Paloma
- Ole, Olli
- Oleander
- Oleg (electropop)
- Olejniczak, Janusz (pianist)
- Oleksza
- Olemus
- Olen
- Olender, Al
- Olenius, Adam
- Olenka & the Autumn Lovers
- Olestar, Los
- Olexandr Ignatov
- Olexesh (German rapper)
- Olexesh & AJÉ
- Olexesh & AK Ausserkontrolle
- Olexesh & Amo
- Olexesh & Azzi Memo
- Olexesh & Bonez MC
- Olexesh & Capital Bra
- Olexesh & Haaland936
- Olexesh & Katch, DJ
- Olexesh & Nimo
- Olexesh & O.G.
- Olexesh feat. AJÉ
- Olexesh feat. Blumenblatt, Marla
- Olexesh feat. Ćelo & Abdï
- Olexesh feat. Ćelo & Abdï & Chaker
- Olexesh feat. Ćelo, Abdi & Hanybal
- Olexesh feat. Edin
- Olexesh feat. Eko Fresh
- Olexesh feat. Hanybal
- Olexesh feat. Karate Andi
- Olexesh feat. Nimo
- Olexesh feat. Sido
- Olexesh feat. Veysel
- Olexesh feat. Wainwright, Karen J.
- Olexesh feat. Yasha
