- 1 OCTOBER
- 2 ONSEEON
- 3 Otokaze
- 4 Outsider
- 5 Orangestar
- 6 OTHANKQ
- 7 Onoken
- 8 OVAN
- 9 OSUN
- 10 On.U
- 11 otetsu
- 12 OLDE WORLDE
- 13 Olltii
- 14 OneSun
- 15 Okasian
- 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)