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