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