- 1 Olly Murs
- 2 OMFG
- 3 Oliver Tree
- 4 Odetari
- 5 Ozzy Osbourne
- 6 OMER DEEP
- 7 Offset
- 8 Omar Akram
- 9 Ozuna
- 10 Oscar Peterson
- 11 Otis Redding
- 12 Omi
- 13 Oliver Scheffner
- 14 Omar Rudberg
- 15 Ookay
- 16 Overseer
- 17 OTR
- 18 OmenXIII
- 19 Otis Spann
- 20 Oskar Schuster
- 21 Owsey
- 22 Ottomix
- 23 Omarion
- 24 Obie Trice
- 25 Orlando Dixon
- 26 Oscar Isaac
- 27 Omnia
- 28 Orjan Nilsen
- 29 Osunlade
- 30 Oliver Moldan