- 1 Olly Murs
- 2 OMFG
- 3 Ozzy Osbourne
- 4 Omar Akram
- 5 Oliver Tree
- 6 Offset
- 7 Oliver Heldens
- 8 Odetari
- 9 Ozuna
- 10 Ozielzinho
- 11 OsamaSon
- 12 Okapi
- 13 Ogryzek
- 14 Oskar Schuster
- 15 Oliver Scheffner
- 16 Owsey
- 17 Omarion
- 18 Outasight
- 19 OMER DEEP
- 20 Omi
- 21 Offer Nissim
- 22 Otis Redding
- 23 Orjan Nilsen
- 24 Obie Trice
- 25 Oscar Peterson
- 26 Orlando Dixon
- 27 Oscar Isaac
- 28 Omnia
- 29 Osunlade
- 30 Oliver Moldan