- 1 OCTOBER
- 2 Orangestar
- 3 Otokaze
- 4 Outsider
- 5 Onoken
- 6 Ourealgoat
- 7 O3ohn
- 8 On.U
- 9 otetsu
- 10 OLDE WORLDE
- 11 Olltii
- 12 OneSun
- 13 Okasian
- 14 Optical Eyez XL
- 15 Oki
- 16 Odee
- 17 OJ
- 18 osterreich
- 19 O!Gon
- 20 ONE
- 21 Ottiki
- 22 Owen Ovadoz
- 23 One Up (원업)
- 24 One Life
- 25 One
- 26 OFA
- 27 Owol
- 28 Ohwon Lee (진짜사나이)
- 29 OVER ARM THROW
- 30 ONGYA