Artists
- O'Jays
- OMD
- OMI
- Oasis
- Agnes Obel
- Alexander O'Connor
- Alexander O'Neal
- Anita O'Day
- Armel O.Connor
- Ben Oakland
- Ben Oakland
- Betsy O'Hogan
- Billy Ocean
- Brendan O'Dowda
- Calisto Oberti
- Camaron Ochs
- Casimir Oberfeld
- Charles O'Malley
- Charles Oberthür
- Christopher O'Brien
- Damien O'Kane
- Daniel O'Donoghue
- Daru Oda
- Desmond O'Connor
- Dolores O'Riordan
- Donald O'Keefe
- Dorota Obijalska
- Edoardo Oddone
- Edward O'Brien
- Fernando Jaumandreu Obradors
- Frank Ocean
- G. O. Schöneman
- George Odam
- Gilbert Obermair
- Hall & Oates
- Helen O'Connell
- Helmut Oehring
- Jack O'Brien
- Jack O'Hagan
- Jacob Obrecht
- James O'Donnell
- Jana Obravska
- Johannes Ockeghem
- John O'Neill
- John Oates
- Jon O'Mahony
- José A Ochaita Garcia
- José Antonio Ochaíta García
- Karola Obermüller
- Kim O'Leary
- Matthew O'Donovan
- Mattie O'Neil
- Maureen O'Hara
- Meredith Oakes
- Michael Obst
- Mighty Oaks
- Nicholas O'Malley
- Nicolas Obouhov
- Noel O'Regan
- P. J. O'Reilly
- Patti O'Connor
- Peter O'Toole
- Philip Oakey
- Philippe Oboussier
- Ric Ocasek
- Roberto Sánchez Ocampo
- Rodolfo Obermüller
- Samir Odeh-Tamimi
- Seupel Odette
- Shavarsh Odadjian
- Sinead O' Carroll
- Sinead O'Connor
- Talbot O'Farrell
- Tarik O'Regan
- Tom Odell