- 1 Olly Murs
- 2 OMFG
- 3 Ozzy Osbourne
- 4 Omar Akram
- 5 Odetari
- 6 Oliver Tree
- 7 Omar
- 8 Omi
- 9 Oliver Scheffner
- 10 Ozuna
- 11 Offset
- 12 Ozielzinho
- 13 Offer Nissim
- 14 Ola
- 15 Overwerk
- 16 Olly James
- 17 Oh well.
- 18 Obadiah Brown-Beach
- 19 Oliver Shanti
- 20 Ookay
- 21 Oskar Schuster
- 22 Omarion
- 23 Obie Trice
- 24 Oscar Peterson
- 25 Orlando Dixon
- 26 Otis Redding
- 27 Oscar Isaac
- 28 Omnia
- 29 Orjan Nilsen
- 30 Osunlade