- 1 Osamu Fukuzawa
- 2 ONiLL
- 3 OLOGI
- 4 One Life
- 5 Odee
- 6 OTHANKQ
- 7 Owol
- 8 Onoken
- 9 Owler
- 10 ONDD
- 11 Ourealgoat
- 12 ONSEEON
- 13 OHTORA
- 14 OXYNOVA
- 15 Old Yearning
- 16 oceanfromtheblue(오션)
- 17 Okid
- 18 OTIKA
- 19 Orangestar
- 20 ONLEE
- 21 OSUM
- 22 O3ohn
- 23 Omoi
- 24 Odd95
- 25 Off The Topline
- 26 OSSH
- 27 Otis Lim
- 28 ONCE
- 29 OMSB
- 30 OSUN