- 1 ONE OK ROCK
- 2 OH MY GIRL
- 3 Official髭男dism
- 4 ONEUS
- 5 ONE OR EIGHT
- 6 ONEWE
- 7 Orange Caramel
- 8 Omoinotake
- 9 OT
- 10 Orange Range
- 11 OxT
- 12 OnlyOneOf
- 13 offonoff
- 14 ONF
- 15 ONE N' ONLY
- 16 ONE PACT
- 17 ON/OFF
- 18 Orange Pekoe
- 19 Oreskaband
- 20 OLDCODEX
- 21 ONE☆DRAFT
- 22 OFFROAD
- 23 ODD EYE
- 24 Oneway
- 25 OKAMOTO'S
- 26 OVER ACTION
- 27 OCEANLANE
- 28 One Piece
- 29 One Buck Tuner
- 30 ONEPERCENTRES