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