| Oh Susanna |
| Oh Susannah |
| OH! TIGER MOUNTAIN |
| Oh Why? |
| Oh Wonder |
| Ohara |
| Ohash |
| Ohashi Takuya |
| OhAy |
| Ohbrave |
| Ohdrina |
| Ohgeesy |
| OhGr |
| Ohh Yeah |
| OHHMS |
| Ohio Express |
| Ohio Players |
| Ohio State University Marching Band |
| Ohio University Leading Tones |
| Ohjd |
| Ohm-G |
| Ohm Guru |
| OHM THECAT |
| Ohmega Watts |
| Ohmme |
| OhMonDieuSalva |
| OHN |
| OhPlai |
| Ohrbooten |
| Ohrkid |
| Ohta-San |
| Oi Polloi |
| Oi Va Voi |
| OIJ |
| Oik |
| Oil |
| Oil Fox |
| Oil on Canvas |
| Oily Rags |
| Oingo Boingo |
| Oinker Doinkers |
| Oitavo Esquerdo |
| OJ da Juiceman |
| OJ Mariano |
| Ojai Valley Boys |
| Ojas |
| Ojerime |
| Ojete Calor |
| Ojo |
| Ojos de Brujo |
| Ok Go |
| OK KID |
| Ok Moon |
| Ok, tyler |
| OKAMOTO'S |
| Okan Akçay |
| Okan Aktaş |
| Okan Özbakır |
| Okan Tok |
| Okapi Guitars |
| Okasian |
| Okay |
| Okay Aybey |
| Okay Barış |
| Okay Kaya |
| Okay Mann |
| Okefenokee Orchestra |
| Oken |
| Okfella |
| Oki |
| Okí© |
| Oki Kano |
| Okiah |
| Okid |
| Okieriete Onaodowan |
| Okills |
| Okin |
| Okke Punt |
| Okkervil River |
| Okko |
| Oklou |
| Okmalumkoolkat |
| Okoumé |
| Oksana |
| Okta Logue |
| Oktay Gürtürk |
| Oktay Özdemir |
| Okvsho |
| Ol' 55 |
| Ol' dirty bastard |
| Ol Kainry |
| Ol Skool |
| Ola |
| Ola Åkerman |
| Ola Gjeilo |
| Ola Kvernberg |
| Ola Nordmann |
| Ola Onabulé |
| Ola Podrida |
| Ola Radwańska |
