- One Way North
- Ophelia's Looking Glass
- O.H
- Ole-E
- ooodisea
- Obee Layne
- Orquesta Soledad
- OHMWAR
- Onus B. Johnson
- OG Chuccy
- OUL
- 欧妹儿ya
- OfficiallJAY
- Orasa Sete
- Other Properties
- Ori-Gen
- Official Spill
- Olivier de la Celle
- Oguz Demiroz
- Omer Dizdarevic
- Omy De Oro
- Oneisha Rean
- Olivier Florio
- Obstruktor
- Ote Montana
- Orrin “Checkmate” Hudson
- octy
- Ovartajkel
- offbeat Trio
- OB Santana
- oolong_tea
- OMG BANDZZ
- Onionsfans
- Oh Funk This Bit
- Of Wolves and Ravens
- OBT
- Olly
- Oken
- ODD Luu
- ObsidianRounds
- Old Hope
- Oxtekxo
- Oxym
- Obed Bronco
- OutlawBaybee
- OOSOOM
- ORK Oriental
- Orpheus Omega
- Object117
- Over October
- Ozzie.
- Oddateee
- O D D S Y N
- Oso Crazy
- Otro Wey
- Oriol Farre
- Obi Homer
- Ointment Stall
- Olivier Dulac
- Official Watson
- OKZIYX
- One Hour Yoga Music
- Os Portugas
- Otis Lockwood
- Oxygen5
- Oakview Cozen
- Oneiropagida
- Orchestra Irmãos Araújo
- Osmo Vänskä
- OXYY
- Oddvar Stegegjerdet
- Ojexmayer
- Originals No Fear
- 欧阳见（半首）
- Ozzi Di Mello
- Ot9beno
- Osvaldo Rodriguez
- Orchestra Veneziana
- Orquesta La Playa
- OldH3ad
- OReeel
- Oglock OG Lock
- Orquestra Simfónica de Barcelonan i Nacional de Catalunya
- Openrivers
- Ocean of Illusions
- Orquesta Sinfónica de Radio Stuttgart
- ONONO
- Ojex
- Ok.Dan Kayo
- orange waves
