- Oretachi ni Tsubasa wa Nai: Hadairo Ritsu Kyuuwari Zou!? (Dub)
- Oretachi ni Tsubasa wa Nai: Under the Innocent Sky. (Dub)
- Orient
- Orient (Dub)
- Orient: Awajishima Gekitou-hen
- Orient: Awajishima Gekitou-hen (Dub)
- Origin: Spirits of the Past
- Oroka na Tenshi wa Akuma to Odoru
- Oroka na Tenshi wa Akuma to Odoru (Dub)
- Oruchuban Ebichu
- Osake wa Fuufu ni Natte kara
- Osamu Tezuka`s Buddha Movie 1
- Osananajimi ga Zettai ni Makenai Love Comedy
- Oseam
- Oshare Kozou wa Hanamaru
- Oshi ga Budoukan Ittekuretara Shinu
- Oshi ga Budoukan Ittekuretara Shinu (Dub)
- Oshiete Mahou no Pendulum: Rilu Rilu Fairilu
- Oshiete! Galko-chan
- Oshiete! Galko-chan OVA
- Oshiri Kajiri Mushi
- Osomatsu-kun
- Osomatsu-kun (1988)
- Osomatsu-san
- Osomatsu-san (Dub)
- Osomatsu-san 2
- Osomatsu-san 2nd Season (Dub)
- Osomatsu-san 3rd Season
- Osomatsu-san Movie
- Osomatsu-san Movie: Gekijou Koukai Kinen - Original Tanpen Gekijou
- Osomatsu-san Special
- Osomatsu-san Year-End Special
- Osomatsu-san: Hipipo-Zoku to Kagayaku Kajitsu
- Osomatsu-san: Ouma de Kobanashi
- Osomatsu-san: Tamashii no Takoyaki Party to Densetsu no Otomarikai
- Osu!! Karate-bu
- Otaku no Video
- Otogi Juushi Akazukin
- Otogizoushi
- Otoko Ippiki Gaki Daishou
- Otokogi
- Otome Game Sekai wa Mob ni Kibishii Sekai desu
- Otome Game Sekai wa Mob ni Kibishii Sekai desu (Dub)
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta...
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... (Dub)
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... OVA
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... OVA (Dub)
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... Voice Drama
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... X
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... X (Dub)
- Otome Youkai Zakuro
- Otome Youkai Zakuro Picture Drama
- Otome wa Boku ni Koishiteru
- Otome wa Boku ni Koishiteru: Trinkle Stars The Animation
- Otona Joshi no Anime Time
- Otona no Bouguya-san
- Otona no Bouguya-san (Rimen)
- Otona no Bouguya-san 2nd Season
- Otonari ni Ginga
- Otonari ni Ginga (Dub)
- Otonari no Tenshi-sama ni Itsunomanika Dame Ningen ni Sareteita Ken
- Ou Dorobou Jing in Seventh Heaven
- Ou Dorobou Jing in Seventh Heaven (Dub)
- Ougon Bat
- Ougon Senshi Gold Lightan
- Ouran High School Host Club
- Ouran Koukou Host Club (Dub)
- Ousama Game The Animation
- Ousama Game The Animation (Dub)
- Ousama Ranking
- Ousama Ranking (Dub)
- Ousama Ranking: Yuuki no Takarabako
- Ousama Ranking: Yuuki no Takarabako (Dub)
- Oushitsu Kyoushi Haine
- Oushitsu Kyoushi Haine (Dub)
- Oushitsu Kyoushi Heine Movie
- Outbreak Company
- Outbreak Company (Dub)
- Outlanders
- Outlanders (Dub)
- Outlaw Star
- Outrageous! I Really Didn’t Want to Open a Training Class For Empresses!
- Oval x Over
- Over Drive
- Overlord
- Overlord (Dub)
- Overlord Combat Maid Chibi Comedy Spinoff
- Overlord II
- Overlord II (Dub)
- Overlord III
- Overlord III (Dub)
- Overlord IV
- Overlord IV (Dub)
- Overlord Movie 1: Fushisha no Ou
- Overlord Movie 2: Shikkoku no Eiyuu
- Overlord: Ple Ple Pleiades (OVA)
- Overlord: Ple Ple Pleiades - Clementine Toubou-hen
- Overlord: Ple Ple Pleiades 2
- Overlord: Ple Ple Pleiades 3
- Overlord: Ple Ple Pleiades 4
- Overman King Gainer
- Overman King Gainer (Dub)
- Overmortal
- Overtake!
- Owari no Seraph
- Owari no Seraph (Dub)
- Owari no Seraph 2nd Season (Dub)
- Owari no Seraph: Kyuuketsuki Shahar
- Owari no Seraph: Nagoya Kessen-hen
- Owari no Seraph: Nagoya Kessen-hen - Owaranai Seraph - Nagoya Kessen-hen
- Owari no Seraph: Owaranai Seraph
- Owarimonogatari
- Owarimonogatari 2nd Season
- Oyayubi Hime Monogatari Movie
- Oz no Mahoutsukai (1986)
- Oz no Mahoutsukai (1986) (Dub)
- Ozanari Dungeon: Kaze no Tou
- Ozmafia!!
- Ozuma
