- 1 Olly Murs
- 2 OMFG
- 3 Ozzy Osbourne
- 4 Oliver Tree
- 5 Omar Akram
- 6 Offset
- 7 Ogryzek
- 8 Ozielzinho
- 9 ONR
- 10 Ozuna
- 11 Odetari
- 12 Outertone
- 13 Olly James
- 14 Oscar Peterson
- 15 Otis Redding
- 16 Oskar Schuster
- 17 Omar Montes
- 18 Overseer
- 19 OutaMatic
- 20 Original Motion Picture Soundtrack
- 21 Omarion
- 22 Obie Trice
- 23 Orlando Dixon
- 24 Oscar Isaac
- 25 Omnia
- 26 Orjan Nilsen
- 27 Osunlade
- 28 Oliver Moldan
- 29 Ominus
- 30 Oliver Nelson