- 1 Olly Murs
- 2 Offset
- 3 OMFG
- 4 Ozzy Osbourne
- 5 Ozielzinho
- 6 Oliver Tree
- 7 Odetari
- 8 Omar Akram
- 9 Omi
- 10 Oliver Scheffner
- 11 Omah Lay
- 12 Omarion
- 13 OutaMatic
- 14 Oxlade
- 15 Omar Apollo
- 16 OmenXIII
- 17 Obie Trice
- 18 Oscar Peterson
- 19 Orlando Dixon
- 20 Otis Redding
- 21 Oscar Isaac
- 22 Omnia
- 23 Orjan Nilsen
- 24 Osunlade
- 25 Oliver Moldan
- 26 Ominus
- 27 Oliver Nelson
- 28 o'landa draper
- 29 Obba Babatunde
- 30 Ol' Dirty Bastard