- 1 Olly Murs
- 2 OMFG
- 3 Ozzy Osbourne
- 4 Odetari
- 5 Oliver Tree
- 6 Ozuna
- 7 Oliver Shanti
- 8 Otto Knows
- 9 Oscar Peterson
- 10 Owsey
- 11 Oscar Dunbar
- 12 Overwerk
- 13 Omi
- 14 Oliver Scheffner
- 15 Otto A. Totland
- 16 Omarion
- 17 Obie Trice
- 18 Orlando Dixon
- 19 Otis Redding
- 20 Oscar Isaac
- 21 Omnia
- 22 Orjan Nilsen
- 23 Osunlade
- 24 Oliver Moldan
- 25 Ominus
- 26 Oliver Nelson
- 27 o'landa draper
- 28 Obba Babatunde
- 29 Ol' Dirty Bastard
- 30 Olav Basoski