Artists
- OneRepublic
- Opera Babes
- Opus
- Alberto Orefici
- Alexander Oriet
- All 4 One
- Antonio Ongarello
- Beth Orton
- Boris Ord
- Buxton Orr
- Carl Orff
- Carlos Ortiz-Rivera
- Charles Wilfred Orr
- Cyril Ornadel
- Daniel Omelio
- David Oppenheim
- Dead Or Alive
- Dewayne Orender
- Edward Ory
- Emmanuel Oriol
- Fher Olvera
- Félix Ortiz Torres
- Gary Osborne
- George Onslow
- George Oppenheimer
- Gertrud Orff
- Giacomo Orefice
- György Orbán
- Harold Orenstein
- Harold Orlap
- Harry Ore
- Henry Onorati
- Hiawyn Oram
- James Last And His Orchestra
- Jason Orange
- Jeffrey Osborne
- Jessica Origliasso
- John Ondrasik
- Josefine Opsahl
- Kenny Ortega
- Kevin Olson
- Leslie Osborne
- Lisa Origliasso
- Luis Ortiz-Rivera
- Lynn Freeman Olson
- Léon Orthel
- Marcel Orban
- Martin Omartian
- Maurice Onderet
- Michael Omari
- Mustafa Omer
- Neil Ormandy
- New Order
- Otto Olsson
- Pablo Ortiz
- Rita Ora
- Riz Ortolani
- Riziero Ortolani
- Robert Orledge
- Roland Orzabal
- Romeo Orsi
- Roy Orbison
- Russ Morgan & His Orchestra
- Savoy Orpheans
- Shimrit Or
- Silvio Omizzolo
- Sydney G. Osborne
- The Harry James Orchestra
- Tony Osborne
- Victor Orsborn
- Walking On Cars
- Walter Orange
- William Orbaugh
- William Orbit
- Willson Osborne