- 1 OCTOBER
- 2 Orangestar
- 3 Outsider
- 4 Onoken
- 5 ONE
- 6 Otokaze
- 7 Okasian
- 8 O3ohn
- 9 OTIKA
- 10 OVAN
- 11 oceanfromtheblue(오션)
- 12 OFA
- 13 Olltii
- 14 OdAkEi
- 15 Omak
- 16 OSUN
- 17 otetsu
- 18 On.U
- 19 Optical Eyez XL
- 20 osterreich
- 21 OLFA ASTRA
- 22 OTHANKQ
- 23 OK OAH(오케이 오아)
- 24 OLNL
- 25 Oh Hee Jun
- 26 Otamania
- 27 Olivera Miljakovic
- 28 O'NUT
- 29 OOPARTZ
- 30 O’YOUNG