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