- Osomatsu-san 3rd Season
- Oshiri Kajiri Mushi
- Osomatsu-san: Tamashii no Takoyaki Party to Densetsu no Otomarikai
- Oroka na Tenshi wa Akuma to Odoru
- Osomatsu-san: Ouma de Kobanashi
- Ore wo Suki nano wa Omae dake ka yo: Oretachi no Game Set
- Osomatsu-san
- Ore, Tsushima
- Ore no Nounai Sentakushi ga, Gakuen Love Comedy wo Zenryoku de Jama Shiteiru OVA
- Osomatsu-san Movie
- Giniro no Kami no Agito
- Oruchuban Ebichu
- Ore wo Suki nano wa Omae dake ka yo
- Ooyukiumi no Kaina: Hoshi no Kenja
- Ore no Imouto ga Konnani Kawaii Wake ga Nai.: SD Chara ni Yoru Short Movie
- Ore no Imouto ga Konnani Kawaii Wake ga Nai.
- Opus.COLORs
- Oshiete! Galko-chan: Natsuyasumi tte Hontou desu ka?
- Oreca Battle
- Otona no Bouguya-san (Rimen)
- Orient
- Oretachi ni Tsubasa wa Nai: Under the Innocent Sky.
- Oresama Kingdom
- Osake wa Fuufu ni Natte kara
- Overlord: Ple Ple Pleiades 3
- Otona Joshi no Anime Time
- Otome Game Sekai wa Mob ni Kibishii Sekai desu
- Otona no Bouguya-san II
- Ousama Ranking
- Otome wa Boku ni Koishiteru
- Ouran Koukou Host Club
- Otonari no Tenshi-sama ni Itsunomanika Dame Ningen ni Sareteita Ken
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... OVA
- Otaku no Video
- Ousama Ranking: Yuuki no Takarabako
- Otonari ni Ginga
- Overlord Movie 2: Shikkoku no Eiyuu
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... Voice Drama
- Otome wa Boku ni Koishiteru: Trinkle Stars The Animation
- Overlord IV
- Overlord: Ple Ple Pleiades 4
- Oushitsu Kyoushi Heine Movie
- Overlord II
- Over Drive
- Ousama Game The Animation
- Overlord
- Overlord: Ple Ple Pleiades
- Overlord: Ple Ple Pleiades 2
- Overlord Movie 1: Fushisha no Ou
- Ougon Bat
