- 1 OCTOBER
- 2 Outsider
- 3 Orangestar
- 4 Otokaze
- 5 Onoken
- 6 Ourealgoat
- 7 OVAN
- 8 oceanfromtheblue(오션)
- 9 otetsu
- 10 Okasian
- 11 O'Domar
- 12 Osshun Gum
- 13 OdAkEi
- 14 ONE
- 15 O3ohn
- 16 Olltii
- 17 OSUN
- 18 On.U
- 19 OLDE WORLDE
- 20 OneSun
- 21 Optical Eyez XL
- 22 Oki
- 23 Odee
- 24 osterreich
- 25 O!Gon
- 26 Owen Ovadoz
- 27 One Up (원업)
- 28 One Life
- 29 One
- 30 OFA