- 1 Olly Murs
- 2 Ozzy Osbourne
- 3 OMFG
- 4 Offset
- 5 Oliver Tree
- 6 Ozielzinho
- 7 Otto Knows
- 8 Ozuna
- 9 OsamaSon
- 10 Orjan Nilsen
- 11 Obadiah Brown-Beach
- 12 Otis Redding
- 13 Oliver
- 14 Ookay
- 15 Oscar Peterson
- 16 OTR
- 17 Oscar Yuan
- 18 Okna Tsahan Zam
- 19 Olav Basoski
- 20 Omarion
- 21 Omar
- 22 OPIUO
- 23 Olivver the Kid
- 24 Ottomix
- 25 Otis Taylor
- 26 Oskar Schuster
- 27 Ol' Dirty Bastard
- 28 orb1t
- 29 Omi
- 30 O.T. Genasis