- Onipan!
- Onegai My Melody: Kuru Kuru Shuffle!
- Onmyo Kaiten Re:Birth Verse
- OniAi Specials
- Oneechan ga Kita: Hajimete no… Kitaa!
- Onegai My Melody
- Onimusha
- One Room Second Season Special
- Ore ga Ojousama Gakkou ni "Shomin Sample" Toshite Gets♥Sareta Ken Specials
- One Piece: Heart of Gold
- Outburst Dreamer Boys
- Opus.COLORs
- Orange
- Orange: Mirai
- Ore ga Suki nano wa Imouto dakedo Imouto ja Nai Specials
- Our Last Crusade or the Rise of a New World
- Ooya-san wa Shishunki!
- Oomuro-ke: Dear Friends
- Our Last Crusade or the Rise of a New World Season 2
- Oreshura
- One Step Toward Freedom
- Orient
- Oreca Battle
- Osomatsu-san 3rd Season
