- 1 Owsey
- 2 Overload
- 3 Ogryzek
- 4 ODK Beats
- 5 Only One Felipe
- 6 ONNT3X
- 7 Oscar And The Wolf
- 8 Oscar Yuan
- 9 Outertone
- 10 Olly Wall
- 11 One Acen
- 12 Oskar
- 13 Olivier Weiter
- 14 Oceanic
- 15 Orito Cantora
- 16 Oscar Rocchi
- 17 OmenXIII
- 18 October London
- 19 Oscar Mulero
- 20 Osvaldo Fresedo
- 21 Oscar Scheller
- 22 OSHI
- 23 Othello
- 24 Olivier Messiaen
- 25 Obie Trice
- 26 Olsen
- 27 Otello Profazio
- 28 Ohana Bam
- 29 Ozuna
- 30 Optic Nerve