- OniAi Specials
- Onimai: I'm Now Your Sister!
- Onigiri
- Okami-San and Her Seven Companions
- Onimai: I'm Now Your Sister! (Uncensored)
- Onimusha
- Onmyouji
- Otherside Picnic
- Opus.COLORs
- Orenchi no Furo Jijou
- Orange
- ORESUKI Are you the only one who loves me?
- One Room Second Season Special
- Orange: Mirai
- ORESUKI Are you the only one who loves me: Game Over
- Ooya-san wa Shishunki!
- Oomuro-ke: Dear Friends
- Otaku no Video
- Outburst Dreamer Boys
- Otogi Zoshi: The Legend of Magatama
- Oshiete Mahou no Pendulum: Rilu Rilu Fairilu
- One Piece: Soccer King of Dreams
- Otaku no Seiza
- Orient Part 2
