- 1 ONE OK ROCK
- 2 Orange Caramel
- 3 OH MY GIRL
- 4 Official髭男dism
- 5 ONE N' ONLY
- 6 ONEUS
- 7 ONEWE
- 8 OMEGA X
- 9 OnlyOneOf
- 10 ONF
- 11 Omoinotake
- 12 ONE LOVE ONE HEART
- 13 ODD EYE CIRCLE
- 14 Oreskaband
- 15 ORESAMA
- 16 Orange Range
- 17 OCTPATH
- 18 OH MY GIRL BANHANA
- 19 Obroject
- 20 Only this time
- 21 ONE☆DRAFT
- 22 offonoff
- 23 OxT
- 24 OLDCODEX
- 25 OKAMOTO'S
- 26 ON/OFF
- 27 OFFROAD
- 28 Oneway
- 29 OVER ACTION
- 30 OGRE YOU A**HOLE