- オーノキヨフミ
- 大野智
- OHNO The Disruptor
- 大貫亜美
- OHO
- Oholics
- O'Hooley & Tidow
- O'Hooligans
- Ohr
- OHR Musik
- Ohr streiche
- Ohrai Trio
- Ohrange
- Ohrbooten
- Ohrchitekt
- Ohrenbär
- Ohrenfeindt
- Ohrsten Nors
- Ohsama
- Ohsha Kai
- Ohshana Pityew
- Ohta San
- Ohta-San
- Ohtasuseri
- Ohtis
- Ohtsuka Kohichiro
- Ohud
- Ohunkie Souls
- Ohvaur
- Ohwihsha
- 大山百合香
- Oh*Yeah
- Oi
- Oi-Melz
- Oi Oi E
- Oi Polloi
- Oi Scouts
- Oi-SKALL Mates
- Oi! The Anonymous
- Oi! The Arrase
- Oi Va Voi
- Oi! Valcans
- Oi-vey
- Oibek
- Oicho
- Oidominion...What?
- Oif Simchas
- Oif Sinchas
- Óige
- 及川光博
- 及川リン
- Oikos
- Oikos Ensemble
- Oikyotaan
- Oil
- Oil!
- Oil
- Oil 10
- Oil Can Harry
- Oil (Christian)
- Oil Filter
- Oil Filter
- Oil for the Hood
- Oil in the Alley
- Oil of Ohlen
- Oil on Canvas
- Oil (Punk)
- Oil Seed Rape
- Oil Silk
- Oil Tasters
- Oil & Water
- Oiler
- Oili Vainio
- Oiltanker
- Oilver Smith
- Oily Rags
- Oimelz
- Oingo Boingo
- Oinqk
- OIO
- Oiro
- Oiseau Rare
- Oiseaux