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