- 1 Olly Murs
- 2 OMFG
- 3 Ozzy Osbourne
- 4 Omar Akram
- 5 Odetari
- 6 Offset
- 7 Ozielzinho
- 8 Oliver Tree
- 9 Ozuna
- 10 Oliver Heldens
- 11 Overwerk
- 12 Oliver Scheffner
- 13 Ogryzek
- 14 OmenXIII
- 15 Oscar Peterson
- 16 Otis Redding
- 17 O.T. Genasis
- 18 orb1t
- 19 Otto Knows
- 20 Oscar Scheller
- 21 Olly James
- 22 Ola Gjeilo
- 23 Orjan Nilsen
- 24 Omarion
- 25 Obie Trice
- 26 Orlando Dixon
- 27 Oscar Isaac
- 28 Omnia
- 29 Osunlade
- 30 Oliver Moldan