- Origin: Spirits of the Past
- Original Dirty Pair: Flight 005 Conspiracy
- Orochi, the Eight-Headed Dragon
- Osake wa Fuufu ni Natte kara: Yuzu Atsukan
- Osamake: Romcom Where The Childhood Friend Won't Lose!
- Oshiete Mahou no Pendulum: Rilu Rilu Fairilu
- Osomatsu-kun (1988)
- Osomatsu-san 3rd Season
- Otaku Elf
- Otaku no Seiza
- Otaku no Video
- Otherside Picnic
- Otherworldly Evil Monarch
- Otogi Zoshi: The Legend of Magatama
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... OVA
- Otome Youkai Zakuro Picture Drama
- Otona no Bouguya-san 2nd Season
- Our Dating Story: The Experienced You and The Inexperienced Me, Kimizero
- Our Home's Fox Deity
- Our Last Crusade or the Rise of a New World
- Our Last Crusade or the Rise of a New World Season 2
- Our love has always been 10 centimeters apart.
- Ouran High School Host Club
- Outbreak Company
- Outburst Dreamer Boys
- Outlanders
- Outlaw Star
- Oval x Over
- Over Drive
- Over Goddess
- Over the Divine Realms
- Over the Sky
- Overflow (TV ver.)
- Overflow (Uncensored)
- Overlord
- Overlord II
- Overlord III
- Overlord IV
- Overlord Movie 1: The Undead King
- Overlord Movie 2: The Dark Hero
- 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
- Overlord: The Sacred Kingdom
- Overman King Gainer
- Overtake!
- Owari no Seraph: Vampire Shahar
- Owarimonogatari
- Owarimonogatari Second Season
- Ozanari Dungeon: Kaze no Tou
- Ozma
- Ozmafia!!
- Pachislo Kizoku Gin
- Painting Jianghu: The Legend of Tiangang
- Painting Rivers and Lakes 4
- Painting Rivers and Lakes 5
- Painting Rivers and Lakes 6
- Pale Cocoon
- Pan de Peace!
- Panda no Daibouken
- Pandora Hearts Omake
- Pandora in the Crimson Shell
- Pandora to Akubi
- PandoraHearts
- Pani Poni 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
- Panty & Stocking with Garterbelt 2nd Season
- Panyo Panyo Di Gi Charat
- Panzer Dragoon
- Papa Mama Bye Bye
- Papa no Iukoto wo Kikinasai! OVA
- Papillon Rose
- Paprika
- Paradise Kiss
- Paradox Live the Animation
- Parallel World Pharmacy
- Paranoia Agent
- Parasite Dolls
- Parasyte -the maxim-
- Paroru's Future Island
- Pass the Monster Meat, Milady!
- Pastel Life
- Pastel Memories
- Patalliro!
- Patapata Hikousen no Bouken
- Patema Inverted
- Patema Inverted: Beginning of the Day
- Patlabor Movie 3: WXIII
- Patlabor: The Mobile Police
- Patlabor: The Mobile Police - The TV Series
- Patlabor: The Movie
- Paul Rusch: His Life and Dream
- Paulette's Chair
- Pause! Let Me Check the Walkthrough First
- Peace Maker Kurogane
- PEACE MAKER KUROGANE – Belief & Friend
- Peach Boy Riverside
- Peach Girl: Super Pop Love Hurricane
- Peerless Battle Spirit
- Peerless Martial Spirit
- Penguin Highway
- Penguin Musume Heart
- Penguin Musume Heart Special
- Penguin's Memory: Shiawase Monogatari
- Penguindrum
- Perfect Blue
- Perfect World
- Perfect World Movie
- Perman (1983)
- 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
- Persona 4 the Animation: No One is Alone
- Persona 4 the Golden ANIMATION
- Persona 5 The Animation
- Persona 5 the Animation Specials
- Persona 5 the Animation TV Specials
- Persona: Trinity Soul
- Pet
- Pet Shop of Horrors
- Peter Grill and the Philosopher's Time
- Peter Grill and the Philosopher's Time [Uncensored]
- Peter Grill and the Philosopher's Time: Super Extra
- Peter Grill and the Philosopher's Time: Super Extra (Uncensored)
- Peter Pan & Wendy
- Petit Seka
