All - A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z
| Name | Alternative/Original Name | Notes | Artist | Availability |
|---|---|---|---|---|
| only my railgun | To aru Kagaku no RAILGUN OP1 | fripSide | KY TJ | |
| Oogoe DIAMOND | 大声ダイヤモンド | AKB48 | KY TJ | |
| Oops!... I Did It Again | Britney Spears | KY P TJ | ||
| Orchestral Fantasia | Nana Mizuki | TJ | ||
| ORION | Ryuusei no Kizuna | Mika Nakashima | KY TJ | |
| OSCA | Tokyo Jihen | KY | ||
| Over | Mr. Children | KY | ||
| OVER | Hey! Say! JUMP | KY TJ | ||
| Overdrive | Eraserheads | P TJ | ||
| Overfly | Sword Art Online ED2 | Luna Haruna | KY | |
| Over Load | Mika Nakashima | KY | ||
| Over Soul | Shaman King OP1 | Megumi Hayashibara | KY TJ | |
| Owarinaki Tabi | 終わりなき旅 | Naguru Onna OST | Mr. Children | KY TJ |