- One Room Third Season
- One Step Toward Freedom
- Operation Han-Gyaku-Sei Million Arthur 2nd Season
- Operation Han-Gyaku-Sei Million Arthur
- Oedo wa Nemurenai!
- Odd Taxi Movie: In the Woods
- Oban Star-Racers
- Odin: Starlight Mutiny
- Oh! My Goddess (2011) OVA
- Odd Taxi
- Ocha-ken: Chokotto Monogatari
- Obey Me!
- Obey Me! 2nd Season
- Occultic;Nine
- Oda Cinnamon Nobunaga
- Oshi No Ko Season 2
- Obake Zukan
- Offside (TV)
- Oh! Edo Rocket
- Okaimono Panda!
- Okoshiyasu, Chitose-chan
- Oishinbo
- Ojisan and Marshmallow
- Ogami Matsugorou
