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