- Ocie Stockard
- Oscar McLollie & His Honey Jumpers
- Oliver Black
- OK Jazz Band
- Olympia Brass Band
- Okano Hironori
- Orquesta Mexico
- Oslo 13
- Onionz & Master D
- One Handed Molly
- Orlando Gough
- Olive Brown
- Omer Simeon
- Oscar Celestin
- Oliver Gene Lake Jr.
- Old Skull
- Out of Worship
- Otto Harwicke
- Osei Jenkins
- October Embrace Her
- Octane OK
- Odus Maggard
- Okoume
- Operating Theater
- Osborne Smith
- Octa Clark
- Ornette Coleman Sound Museum
- One Up Downstairs
- Optical Blue
- One King Down
- Old Bombs
- Open Choir Fire
- Oliver Bondzio
- Orestes Macho Lopez
- Okros Ensemble
- Odell Thompson
- Otis Leavill
- Original Creole Band
- Original Ramblers
- Oleg Lundstrem
- Overdose of Heavy Psych
- Os Caretas
