- 1 Olly Murs
- 2 OMFG
- 3 Ozzy Osbourne
- 4 Odetari
- 5 Oliver Tree
- 6 Omar Akram
- 7 Offset
- 8 Ogryzek
- 9 Ozielzinho
- 10 Omar Rudberg
- 11 Overwerk
- 12 Owsey
- 13 Okapi
- 14 Oddeeo
- 15 Oliver Heldens
- 16 Oskar Schuster
- 17 ohsobrkn
- 18 Omar
- 19 Ottomix
- 20 Original Motion Picture Soundtrack
- 21 Omarion
- 22 Obie Trice
- 23 Oscar Peterson
- 24 Orlando Dixon
- 25 Otis Redding
- 26 Oscar Isaac
- 27 Omnia
- 28 Orjan Nilsen
- 29 Osunlade
- 30 Oliver Moldan