- ORESUKI Are you the only one who loves me: Game Over
- Oretachi ni Tsubasa wa Nai: Under the Innocent Sky.
- Orient
- Orient: Awajishima Gekitou-hen
- Oroka na Tenshi wa Akuma to Odoru
- Osakana wa Ami no Naka
- Osake wa Fuufu ni Natte kara
- Osake wa Fuufu ni Natte kara: Yuzu Atsukan
- Osananajimi ga Zettai ni Makenai Love Comedy
- Osananajimi to wa Love Comedy ni Naranai
- Oshi ga Budoukan Ittekuretara Shinu
- Oshi no Ko 2nd Season
- Oshi no Ko Specials
- Oshiete Mahou no Pendulum: Rilu Rilu Fairilu
- Oshiete! Galko-chan
- Oshiete! Galko-chan: Natsuyasumitte Hontou Desu ka?
- Osomatsu-kun (1988)
- Osomatsu-san
- Osomatsu-san 2nd Season
- Osomatsu-san 3rd Season
- Osomatsu-san 4th Season
- Osomatsu-san Movie
- Osu!! Karate-bu
- Otaku no Seiza
- Otaku no Video
- Otenki Oneesan
- Otogi Juushi Akazukin
- Otogi Story Tenshi no Shippo
- Otogi Story Tenshi no Shippo Specials
- Otogizoushi
- Otohime Connection
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta...
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta… Movie
- 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... X
- Otome Game Sekai wa Mob ni Kibishii Sekai desu
- Otome Youkai Zakuro
- Otome Youkai Zakuro Picture Drama
- Otona no Bouguya-san
- Otona no Bouguya-san II
- Otonari ni Ginga
- Otonari no Tenshi-sama ni Itsunomanika Dame Ningen ni Sareteita Ken
- Ou Dorobou Jing
- Ougon Senshi Gold Lightan
- Ougon Yuusha Goldran
- Ouran Koukou Host Club
- Ouritsu Uchuugun: Honneamise no Tsubasa
- Ousama Game The Animation
- Ousama Ranking
- Ousama Ranking: Yuuki no Takarabako
- Oushitsu Kyoushi Heine
- Oushitsu Kyoushi Heine Movie
- Outbreak Company
- Outlanders
- Oval x Over
- Over Drive
- Overflow
- Overflow (Uncensored)
- Overlord
- Overlord II
- Overlord III
- Overlord IV
- Overlord Movie 1: Fushisha no Ou
- Overlord Movie 2: Shikkoku no Eiyuu
- Overlord Movie 3: Sei Oukoku-hen
- Overlord: Ple Ple Pleiades
- 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
- Overtake!
- Owaranai Seraph
- Owaranai Seraph: Nagoya-hen
- Owari no Seraph
- Owari no Seraph: Kyuuketsuki Shahar
- Owari no Seraph: Nagoya Kessen-hen
- Owarimonogatari
- Owarimonogatari 2nd Season
- Oz no Mahoutsukai (1986)
- Ozanari Dungeon: Kaze no Tou
- Ozma
- Ozmafia!!
- Pachislo Kizoku Gin
- Pale Cocoon
- Palme no Ki
- Pan de Peace!
- Panda no Daibouken
- Pandora Hearts
- Pandora Hearts Omake
- Pandora to Akubi
- Paniponi Dash!
- Paniponi Dash!: Danjite Okonaeba Kishin mo Kore wo Saku
- Pankunchi
- Pants no Ana: Mambo de Ganbo!
- Panty & Stocking in Sanitarybox
- Panty & Stocking with Garterbelt
- Panyo Panyo Di Gi Charat
- Panzer Dragoon
- Papa Mama Bye Bye
- Papa no Iukoto wo Kikinasai!
- Papa no Iukoto wo Kikinasai! OVA
- Papa to Kiss in the Dark
- Papillon Rose
- Paprika
- Paradise Kiss
- Paradox Live the Animation
- Parasite Dolls
- Paripi Koumei
- Paripi Koumei: Road to Summer Sonia
- Paris no Isabelle
- Parol no Miraijima
- Party kara Tsuihou sareta Sono Chiyushi, Jitsu wa Saikyou ni Tsuki
- Pastel Life
- Pastel Memories
- Patalliro!
- Patapata Hikousen no Bouken
- Paulette no Isu
- Peace Maker Kurogane
- Peace Maker Kurogane Movie 1: Omou Michi
- Peach Boy Riverside
- Peach Girl
- Pelican Road Club Caroucha
- Penguin Highway
- Penguin Musume Heart
- Penguin Musume Heart Special
- Penguin's Memory: Shiawase Monogatari
- Perfect Blue
- Perman
- Perrine Monogatari
- Perrine Monogatari Movie
- Persona 3 the Movie 1: Spring of Birth
- Persona 3 the Movie 2: Midsummer Knight's Dream
- Persona 3 the Movie 3: Falling Down
- Persona 3 the Movie 4: Winter of Rebirth
- Persona 4 the Animation
