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