- 1 ONE OK ROCK
- 2 OH MY GIRL
- 3 Official髭男dism
- 4 ONEUS
- 5 ONEWE
- 6 ONE OR EIGHT
- 7 Orange Caramel
- 8 Orange Range
- 9 OMEGA X
- 10 ONF
- 11 OnlyOneOf
- 12 OxT
- 13 OT
- 14 Omoinotake
- 15 ONE LOVE ONE HEART
- 16 ONE N' ONLY
- 17 ONE PACT
- 18 OCTPATH
- 19 ODD YOUTH
- 20 ORESAMA
- 21 OOM
- 22 Oreskaband
- 23 Obroject
- 24 OLDCODEX
- 25 ONE☆DRAFT
- 26 OKAMOTO'S
- 27 Only this time
- 28 offonoff
- 29 OuiOui
- 30 ON/OFF