- On-Gaku: Our Sound
- Ojisan and Marshmallow
- One Punch Man 2nd Season Commemorative Special
- One Punch Man
- One Piece Special: Protect! The Last Great Performance
- One: Kagayaku Kisetsu e
- One Piece: Take Aim! The Pirate Baseball King
- One Piece: Unwavering Justice! The Navy's Proud Log!
- One Punch Man 2nd Season
- One Piece Special: The Detective Memoirs of Chief Straw Hat Luffy
- One Room
- One Piece: Soccer King of Dreams
- One Piece Special: Open Upon the Great Sea! A Father's Huge, HUGE Dream!
- One Piece: Defeat the Pirate Ganzack!
- Onimomomomo
- Onigiri
- Orochi, the Eight-Headed Dragon
- Okko's Inn
- Onimusha
- One Step Toward Freedom
- Ogre Slayer
- Okami-San and Her Seven Companions
- Onmyo Kaiten Re:Birth Verse
- Onyankopon
