- One-Million Year Trip: Bander Book
- Oh! My Goddess (2011) OVA
- Oh! My Goddess: The Adventures of Mini-Goddess
- O Maidens in Your Savage Season
- Once Upon a Witch's Death
- Oblivion Battery
- Outburst Dreamer Boys
- One Way or Another
- Original Dirty Pair: Flight 005 Conspiracy
- One Step Toward Freedom
- Otaku Elf
- Origin: Spirits of the Past
- Operation Han-Gyaku-Sei Million Arthur
- Operation Han-Gyaku-Sei Million Arthur 2nd Season
- Oedo Fire Slayer: The Legend of Phoenix
- Oblivion Island: Haruka and the Magic Mirror
- Ojisan in Another World
- One Week Friends
- Our love has always been 10 centimeters apart.
- Our Dating Story: The Experienced You and The Inexperienced Me, Kimizero
- Our Last Crusade or the Rise of a New World
- Our Last Crusade or the Rise of a New World Season 2
- Over the Sky
- One Hundred Thousand Years of Qi Refining
- Open Your Mind
- Oam Monogatari: Sono Natsu, Watashi ga Shitta koto
- Obake Zukan
- Oban Star-Racers
- Obey Me!
- Obey Me! 2nd Season
- Obsolete
- Occultic;Nine
- Ocha-ken: Chokotto Monogatari
- Ocha-ken: Hotto Monogatari
- Ochibi-san
- Oda Cinnamon Nobunaga
- Odd Taxi
- Odd Taxi Movie: In the Woods
- Odin: Starlight Mutiny
- Oedo wa Nemurenai!
- Offside (TV)
- Ogami Matsugorou
- Oh! Edo Rocket
- Ohayou! Spank (Movie)
- Oishinbo
- Oishinbo: The Japan-America Rice War
- Ojamajo Doremi Sharp Movie
- Ojamajo Doremi: Owarai Gekijou
- Ojamanga Yamada-kun (Movie)
- Ojisan and Marshmallow
- Ojisan and Marshmallow Episode 13: Hige-san and Marshmallow
- Okaimono Panda!
- Okama Report
- Okashi na Sabaku no Suna to Manu
- Okitsura: Fell in Love with an Okinawan Girl, but I Just Wish I Know What She's Saying
- Okoshiyasu, Chitose-chan
- Okoshiyasu, Chitose-chan Recaps
- Okubyou na Venus
- OL Kaizou Kouza
- Omamori Himari
- Omoi no Kakera
- Only Yesterday
- Onara Goro
- One Off
- One Outs
- One Piece
- One Piece - Wano Kuni SP
- One Piece 3D: Gekisou! Trap Coaster
- One Piece 3D: Strawhat Chase
- One Piece 3D2Y: 15th Anniversary
- One Piece Egghead Arc Recap
- One Piece Fan Letter
- One Piece: The Movie 13 - Film: Gold
- ONE PIECE FILM GOLD 〜episode 0〜
- One Piece Film: Red
- One Piece: The Movie 10 - Strong World
- One Piece Film: Strong World Episode 0
- One Piece: The Movie 12 - Film Z
- One Piece Movie 1
- One Piece: Clockwork Island Adventure
- One Piece: Chopper Kingdom of Strange Animal Island
- One Piece: Dead End
- One Piece: The Curse of the Sacred Sword
- One Piece: Baron Omatsuri and the Secret Island
- One Piece Movie 7: Karakuri-jou no Mecha Kyohei
- One Piece: The Movie 8 - Adventures in Alabasta
- One Piece Movie 9: Episode of Chopper Plus - Fuyu ni Saku, Kiseki no Sakura
- One Piece Recap
- One Piece: Adventure of Nebulandia
- One Piece: The Log of the Turbulent Revolution - The Revolutionary Army Maneuvers in Secret!
- One Piece: Barto's Secret Room
- One Piece: Recapping Fierce Fights! The Countercharge Alliance vs. Big Mom
- One Piece: Recapping Fierce Fights! Zoro vs. a Lead Performer!
- One Piece: A Project to Fully Enjoy! `Surgeon of Death` Trafalgar Law
- One Piece: A Comprehensive Anatomy! The Legend of Kozuki Oden!
- One Piece: Dr. Chopper's Adventure Checkup - The Ballad of a Father and Daughter
- One Piece: Dr. Chopper's Adventure Checkup - The Proud Dream of the Giants
- One Piece: Dr. Chopper's Adventure Checkup - Good Friends at a Crossroad
- One Piece: Episode of East Blue
- One Piece: Episode of Luffy - Hand Island Adventure
- One Piece: Episode of Merry - The Tale of One More Friend
- One Piece: Episode of Nami - Tears of a Navigator and the Bonds of Friends
- One Piece: Episode of Sabo - The Three Brothers' Bond
- One Piece: Episode of Skypiea
- One Piece: Glorious Island
- One Piece Log: Fish-Man Island Saga
- One Piece: Heart of Gold
- One Piece: The Log of the Rivalry! The Straw Hats vs. Cipher Pol
- One Piece: Django's Dance Carnival
- One Piece: Making History! The Turbulent Old and New Four Emperors!
- One Piece Special: Protect! The Last Great Performance
- One Piece: Take Aim! The Pirate Baseball King
- One Piece Special: The Detective Memoirs of Chief Straw Hat Luffy
- One Piece Special: Open Upon the Great Sea! A Father's Huge, HUGE Dream!
- One Piece: Romance Dawn Story
- One Piece: Defeat the Pirate Ganzack!
- One Piece: The Movie 14 - Stampede
- One Piece Special: Adventure in the Ocean's Navel
- One Piece: Soccer King of Dreams
- One Piece: Unwavering Justice! The Navy's Proud Log!
- One Pound Gospel
- One Punch Man
- One Punch Man 2nd Season
- One Punch Man 2nd Season Commemorative Special
- One Punch Man 2nd Season Specials
- One-Punch Man Season 3
- One Punch Man Specials
- One Punch Man 3: Specials
- One Punch Man: Road to Hero
- One Room
- One Room Second Season
- One Room Second Season Special
- One Room Third Season
- One: Kagayaku Kisetsu e
- Oneechan ga Kita
- Oneechan ga Kita: Hajimete no… Kitaa!
