- 1 Olly Murs
- 2 OMFG
- 3 Ozzy Osbourne
- 4 Offset
- 5 Oliver Tree
- 6 Odetari
- 7 Omar Akram
- 8 Omi
- 9 Omah Lay
- 10 Olly James
- 11 Oliver Scheffner
- 12 Owsey
- 13 O.T. Genasis
- 14 Ozielzinho
- 15 Ozuna
- 16 Overwerk
- 17 Otto A. Totland
- 18 One True God
- 19 Oscar Isaac
- 20 Oddprophet
- 21 OutaMatic
- 22 Otis Taylor
- 23 Olivver the Kid
- 24 Ottomix
- 25 Obadiah Brown-Beach
- 26 Ol' Dirty Bastard
- 27 Oskar Schuster
- 28 Old Sea Brigade
- 29 orb1t
- 30 Ola Gjeilo