- Oscar Lopez
- Ours to Alibi
- One Eskimo
- Ocean Colour Scene
- Oli. P
- O.A.R.
- Oliver Cheatham
- Old Jerusalem
- Ozomatli
- Orishas
- Ooberman
- Old 97's
- Obi
- Oliver Schroer
- Orquesta Aragón
- Ola Podrida
- One Self
- Omar-S
- Olivier Deriviere
- Ola Strandh
- o+s
- Ornette Coleman
- Ohta-San
- Owen Richards
- Orphaned Land
- Otis Spann
- Otis Taylor
- Oi Va Voi
- Olatz Zugasti
- Otto Dix
- O'Ryan
- Obtenebris
- Out of Eden
- O.V. Wright
- Ornella Vanoni
- Om
- Old Man's Child
- Ohio State University Marching Band
- Oval
- Oingo Boingo
- Olivia
- Oleta Adams
- Orizen
- Ozielzinho
- Ozric Tentacles
- One Minute Silence
- Orlando Consort
- Oracles Always Lie
- Omni Trio
- One Hour Before The Trip
- 欧莉莲
- Old World Vulture
- Old and New Dreams
- Ofer Bashan
- Oceanship
- O'funk'illo
- Osibisa
- Oscar D'León
- Ol Skool
- O.C. Smith
- Obiymy Doschu
- Omega Lithium
- Opera Babes
- Oh No Ono
- Oysterband
- Orson
- Ohio Express
- Oslo Swan
- Olympic Runners
- Orquesta Revé
- Old Man River
- OMC
- Omar & the Howlers
- Orgone
- Outcast
- Original Dixieland Jazz Band
- Oriin
- One For The Team
- Osborne Brothers
- One More Girl
- Oh Darling
- Os Cariocas
- OPM
- Opprobrium
- Otto Von Schirach
- Ochre
- Out of the Grey
- Oxmo Puccino
- Oi Polloi
- Oforia
