- 1 OCTOBER
- 2 Otokaze
- 3 Orangestar
- 4 Onoken
- 5 ONSEEON
- 6 OTHANKQ
- 7 Omoi
- 8 Outsider
- 9 Okasian
- 10 OVAN
- 11 On.U
- 12 otetsu
- 13 OLDE WORLDE
- 14 Olltii
- 15 OneSun
- 16 Optical Eyez XL
- 17 Oki
- 18 Odee
- 19 OJ
- 20 osterreich
- 21 O!Gon
- 22 ONE
- 23 Ottiki
- 24 Owen Ovadoz
- 25 One Up (원업)
- 26 One Life
- 27 One
- 28 OFA
- 29 Owol
- 30 Ohwon Lee (진짜사나이)