- 1 Olly Murs
- 2 Ozzy Osbourne
- 3 Offset
- 4 Odetari
- 5 Ozielzinho
- 6 Omar Akram
- 7 OMFG
- 8 Oliver Tree
- 9 Oliver Scheffner
- 10 Ogryzek
- 11 OsamaSon
- 12 Original Motion Picture Soundtrack
- 13 Oscar Peterson
- 14 Ouse
- 15 Overwerk
- 16 Omi
- 17 Offer Nissim
- 18 Olly James
- 19 Omarion
- 20 Obie Trice
- 21 Orlando Dixon
- 22 Otis Redding
- 23 Oscar Isaac
- 24 Omnia
- 25 Orjan Nilsen
- 26 Osunlade
- 27 Oliver Moldan
- 28 Ominus
- 29 Oliver Nelson
- 30 o'landa draper