- Oreca Battle
- Ore ga Ojousama Gakkou ni "Shomin Sample" Toshite Gets♥Sareta Ken Specials
- Operation Han-Gyaku-Sei Million Arthur
- Otaku Elf
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... OVA
- Otome Youkai Zakuro Picture Drama
- Overlord: Ple Ple Pleiades 4
- Oblivion Island: Haruka and the Magic Mirror
- Occultic;Nine
- Overlord: Ple Ple Pleiades 2
- Obey Me! 2nd Season
- Ocha-ken: Hotto Monogatari
- Obake Zukan
- Obsolete
- Okaimono Panda!
- Oishinbo
- Ogami Matsugorou
- Ozmafia!!
- Ojamajo Doremi: Owarai Gekijou
- Outlaw Star
- Ojamanga Yamada-kun (Movie)
- Offside (TV)
- Oedo wa Nemurenai!
- Odd Taxi Movie: In the Woods
