- 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
- PES – Peace Eco Smile
- PJ Berri no Mogumogu Munyamunya Season 2
- Pac-World
- Pac-World (Dub)
- Pachislo Kizoku Gin
- Pachislot Eureka Seven 3
- Pacific Rim: The Black
- Pacific Rim: The Black (Dub)
- Pacific Rim: The Black Season 2
- Pacific Rim: The Black Season 2 (Dub)
- Pale Cocoon
- Palme no Ki
- Pan de Peace!
- Panda Kopanda (Dub)
- Panda! Go Panda!
- Panda-Z: The Robonimation
- Pandalian (Dub)
- Pandora Hearts
- Pandora Hearts Special
- Pandora to Akubi
- Pani Poni Dash
- Pani Poni Dash OVA
- Paniponi Dash! (Dub)
- Pankunchi
- Pantheon (Dub)
- Pantheon: Season 2 (Dub)
- Panty & Stocking in Sanitarybox
- Panty & Stocking with Garterbelt (Dub)
- Panty & Stocking with Garterbelt OVA (Dub)
- Panty and Stocking with Garterbelt
- Panyo Panyo Di Gi Charat
- Panyo Panyo Di Gi Charat (Dub)
- Panzer Dragoon (Dub)
- Papa datte, Shitai
