• O Rang
• Alexis O'Hara
• Dave O'Higgins
• Stephen O'Malley
• Jim O'Rourke
• Daniel O'Sullivan
• Anita Oday
• Odd Future
• Shinro Ohtake
• Oki
• Will Oldham
• Mary Oliver
• Pauline Oliveros
• Olivier Messiaen
• Tovah Olson
• Björn Olsson
• Om
• Omar Souleyman
• Omni Trio
• On U Sound
• Aki Onda
• The One Ensemble
• Oneness Of Juju
• Oneohtrix Point Never
• Seigen Ono
• Yoko Ono
• OOIOO
• Optigram
• Daphne Oram
• Daphne Oram
• The Orb
• Orbital
• Orchid Spangiafora
• Bill Orcutt
• Oregon
• Origin Unknown
• Genesis P Orridge
• Greg Osby
• Bob Ostertag
• John Oswald
• The Otolith Group
• Otomo Yoshihide
• Tony Oursler
• Out Hud
• Oval
• Oxbow
• Tony Oxley
• Ozomatli