- 1 OCTOBER
- 2 Orangestar
- 3 Otokaze
- 4 ONSEEON
- 5 OTHANKQ
- 6 Onoken
- 7 Omoi
- 8 Outsider
- 9 OVAN
- 10 Okasian
- 11 Olltii
- 12 On.U
- 13 Odee
- 14 Ourealgoat
- 15 otetsu
- 16 oygli
- 17 OSUN
- 18 Omak
- 19 OdAkEi
- 20 oceanfromtheblue(오션)
- 21 OXYNOVA
- 22 O3ohn
- 23 OFA
- 24 OLDE WORLDE
- 25 OneSun
- 26 Optical Eyez XL
- 27 Oki
- 28 OJ
- 29 osterreich
- 30 O!Gon