- 1 Olly Murs
- 2 OMFG
- 3 Ozzy Osbourne
- 4 Oliver Tree
- 5 OMER DEEP
- 6 Offset
- 7 Omar Akram
- 8 Oliver Scheffner
- 9 Obadiah Brown-Beach
- 10 Ozuna
- 11 OsamaSon
- 12 OSHI
- 13 Olly Alexander
- 14 Oscar Peterson
- 15 Ookay
- 16 Ola
- 17 Omah Lay
- 18 Omar Apollo
- 19 ONR
- 20 Oliver Shanti
- 21 Omar
- 22 Oscar Isaac
- 23 Overseer
- 24 Orjan Nilsen
- 25 OJAX
- 26 Obie Trice
- 27 Oryon
- 28 Owsey
- 29 Outasight
- 30 ohsobrkn