- 1 OoOo
- 2 OOHYO
- 3 OLIVIA
- 4 Oranje.
- 5 OH!nle
- 6 Oran-G
- 7 Ora
- 8 ONE
- 9 OSTER project
- 10 OKI
- 11 Only You
- 12 OVCOCO (오브코코)
- 13 Odd Time
- 14 okogeeechann
- 15 OHNEW
- 16 Osanzi
- 17 oiko
- 18 onsu
- 19 Obze (오브제)
- 20 OA
- 21 OPENN (오픈)
- 22 欧若拉
- 23 onthedal
- 24 On1ynn_
- 25 Oo
- 26 OUL (오울)
- 27 ODD-CAT (오드캣)
- 28 Okayuka
- 29 Offing (오핑)
- 30 Otomania