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