- 1 Olly Murs
- 2 OMFG
- 3 Omar Akram
- 4 Oliver Tree
- 5 Ozzy Osbourne
- 6 Offset
- 7 Ozielzinho
- 8 Ogryzek
- 9 Odetari
- 10 ohsobrkn
- 11 Omar Rudberg
- 12 Overwerk
- 13 Original Motion Picture Soundtrack
- 14 Oddeeo
- 15 Omar
- 16 Owsey
- 17 Ottomix
- 18 Oskar Schuster
- 19 Okapi
- 20 Oliver Heldens
- 21 Otto Knows
- 22 Offer Nissim
- 23 Olivier Deriviere
- 24 Oscar Dunbar
- 25 Omah Lay
- 26 Outertone
- 27 Omarion
- 28 Otis Redding
- 29 Otto A. Totland
- 30 Ol' Dirty Bastard