- One Piece: Episode of Sabo - 3 Kyoudai no Kizuna Kiseki no Saikai to Uketsugareru Ishi
- One Piece: Episode of Sorajima
- One Piece: Episode of Sorajima (Dub)
- One Piece: Gyojin Tou-hen
- One Piece: Heart of Gold
- One Piece: Log of Rivalry! The Straw Hats and Cipher Pol
- One Piece: Luffy Senpai Ouen Kikaku! Barto no Himitsu no Heya!
- One Piece: Luffy Senpai Ouen Kikaku! Barto no Himitsu no Heya! (Dub)
- One Piece: Making History! The Turbulent Old and New Four Emperors!
- One Piece: Nami OVA
- One Piece: Recapping Fierce Fights! The Countercharge Alliance vs. Big Mom
- One Piece: Straw Hat Theater
- One Piece: Taose! Kaizoku Ganzack
- One Piece: Yuruganu Seigi! Kaigun no Hokoritakaki Log!
- One Punch Man
- One Punch Man (Dub)
- One Punch Man 2nd Season
- One Punch Man 2nd Season (Dub)
- One Punch Man 2nd Season Commemorative Special
- One Punch Man 2nd Season Specials
- One Punch Man 2nd Season Specials (Dub)
- One Punch Man Specials
- One Punch Man Specials (Dub)
- One Punch Man: Road to Hero
- One Room
- One Room 2nd Season
- One Room Special
- One Room Third Season
- One Room, Hiatari Futsuu, Tenshi-tsuki.
- One Stormy Night Movie
- One Week Friends Kaori no Nikki
- Onee-chan ga Kita
- Onegai My Melody
- Onegai My Melody: Kuru Kuru Shuffle!
- Onegai Teacher
- Onegai Twins
- Onegai Twins (Dub)
- Onegai Twins EP OVA
- Onegai☆Teacher (Dub)
- Ongaku
- Ongaku Shoujo
- Ongaku Shoujo (TV)
- Oni: Thunder God's Tale
- Oni: Thunder God's Tale (Dub)
- OniAi
- OniAi Specials
- Onigamiden
- Onigamiden (Dub)
- Onigiri
- Onigiri (Dub)
- Onigiri ni Naritai Cogimyun
- Onihei
- Onihei (Dub)
- Onihei: Sono Otoko, Heizou Hasegawa
- Onihei: Sono Otoko, Heizou Hasegawa (Dub)
- Onii-chan Dakedo Ai Sae Areba Kankeinai yo ne! Specials
- Oniichan no Koto nanka Zenzen Suki ja Nai n da kara ne!!
- Oniichan wa Oshimai!
- Oniichan wa Oshimai! (Uncensored)
- Oniisama e...
- Onikirimaru
- Onimusha
- Onimusha (Dub)
- Onipan!
- Only I Can Command All the Sects in the World
- Only I Can Use Summoning
- Only Yesterday
- Only Yesterday (Dub)
- Onmyoji Rani
- Onmyou Taisenki
- Onmyouji (Dub)
- Onna Senshi Efe & Jira: Gude no Monshou
- Onsen Yousei Hakone-chan
- Ontama!
- Onyankopon
- Onyx Equinox
- Ooi! Tonbo
- Ooi! Tonbo (Dub)
- Ooi! Tonbo 2nd Season
- Ooi! Tonbo 2nd Season (Dub)
- Ookami Kakushi
- Ookami Kodomo no Ame to Yuki
- Ookami Kodomo no Ame to Yuki (Dub)
- Ookami Shoujo to Kuro Ouji
- Ookami Shoujo to Kuro Ouji OVA
- Ookami Shounen Ken
- Ookami to Koushinryou II: Ookami to Kohakuiro no Yuuutsu
- Ookami to Koushinryou: Merchant Meets the Wise Wolf
- Ookami to Koushinryou: Merchant Meets the Wise Wolf (Dub)
- Ookami-san to Shichinin no Nakama-tachi
- Ookami-san to Shichinin no Nakama-tachi (Dub)
- Ookamikakushi
- Ookiku Furikabutte
- Ookiku Furikabutte (Dub)
- Ookiku Furikabutte Season 2
- Oomuro-ke: Dear Sisters
- Oooku
- Oooku (Dub)
- Ooya-san wa Shishunki!
- Ooyukiumi no Kaina
- Ooyukiumi no Kaina: Hoshi no Kenja
- Opening Awakening Favorability System
- Opus.COLORs
- Orange
- Orange (Dub)
- Orange: Mirai
- Ore Monogatari!!
- Ore Monogatari!! (Dub)
- Ore dake Haireru Kakushi Dungeon
- Ore dake Haireru Kakushi Dungeon (Dub)
- Ore dake Level Up na Ken
- Ore dake Level Up na Ken (Dub)
- Ore dake Level Up na Ken (Korean Dub)
- Ore ga Ojousama Gakkou ni "Shomin Sample" Toshite Gets♥Sareta Ken
- Ore ga Suki nano wa Imouto dakedo Imouto ja Nai
- Ore ga Suki nano wa Imouto dakedo Imouto ja Nai (Uncensored)
- Ore no Imouto ga Konnani Kawaii Wake ga Nai Specials
- Ore no Imouto ga Konnani Kawaii Wake ga Nai.: SD Chara ni Yoru Short Movie
- Ore no Nounai Sentakushi ga, Gakuen Love Comedy wo Zenryoku de Jama Shiteiru OVA
- Ore wa Subete wo "Parry" suru: Gyaku Kanchigai no Sekai Saikyou wa Boukensha ni Naritai
- Ore wa Subete wo "Parry" suru: Gyaku Kanchigai no Sekai Saikyou wa Boukensha ni Naritai (Dub)
- Ore wa Teppei
- Ore wo Suki nano wa Omae dake ka yo
- Ore wo Suki nano wa Omae dake ka yo: Oretachi no Game Set
- Ore, Tsushima
- Ore, Tsushima (ONA)
- Ore, Twintail ni Narimasu. (Dub)
- Ore, Twintails ni Narimasu.
- Ore-sama Kingdom
- Ore-tachi ni Tsubasa wa Nai
- OreImo 2
- OreShura
- Oreca Battle
- Oreimo
- Orenchi no Furo Jijou
- Oretachi ni Tsubasa wa Nai: Hadairo Ritsu Kyuuwari Zou!?
