- 1 ONSEEON
- 2 ONDD
- 3 Owol
- 4 Onoken
- 5 OHTORA
- 6 ONiLL
- 7 Old Yearning
- 8 oceanfromtheblue(오션)
- 9 Okid
- 10 One Life
- 11 OTIKA
- 12 OTHANKQ
- 13 Orangestar
- 14 ONLEE
- 15 OSUM
- 16 Omoi
- 17 Odd95
- 18 Off The Topline
- 19 OSSH
- 20 OXYNOVA
- 21 Otis Lim
- 22 ONCE
- 23 OMSB
- 24 OSUN
- 25 Outsider
- 26 Olltii
- 27 oddjun
- 28 Osshun Gum
- 29 Oki
- 30 OFFVIVID