OS
OM
ON
- Onara Gorou
- One Off
- One Outs
- One Piece
- One Piece 3D2Y: Ace no shi wo Koete! Luffy Nakama Tono Chikai
- One Piece Film: Gold
- One Piece Film: Red
- One Piece Film: Strong World
- One Piece Film: Z
- One Piece Movie 01
- One Piece Movie 02: Nejimaki-jima no Daibouken
- One Piece Movie 04: Dead End no Bouken
- One Piece Movie 05: Norowareta Seiken
- One Piece Movie 06: Omatsuri Danshaku to Himitsu no Shima
- One Piece Movie 07: Karakuri-jou no Mecha Kyohei
- One Piece Movie 14: Stampede
- One Piece: Episode of East Blue - Luffy to 4-nin no Nakama no Daibouken
- One Piece: Episode of Nami - Koukaishi no Namida to Nakama no Kizuna
- One Punch Man
- One Punch Man 2nd Season
- One Punch Man Specials
- One Punch Man: Road to Hero
- One Room
- One Room: Second Season
- Oneechan ga Kita
- Onegai My Melody
- Onegai☆Teacher
- Onegai☆Twins
- Ongaku Shoujo (TV)
- Oni Chichi
- Onigiri
- Onihei
- Oniichan dakedo Ai sae Areba Kankeinai yo ne!
- Oniichan no Koto nanka Zenzen Suki ja Nai n da kara ne!!
- Oniichan wa Oshimai!
- Oniisama e...
OO
OR
- Orange
- Orange: Mirai
- Ore dake Haireru Kakushi Dungeon
- Ore ga Ojousama Gakkou ni "Shomin Sample" Toshite Gets♥Sareta Ken
- Ore ga Suki nano wa Imouto dakedo Imouto ja Nai
- Ore Monogatari!!
- Ore no Imouto ga Konnani Kawaii Wake ga Nai
- Ore no Imouto ga Konnani Kawaii Wake ga Nai Specials
- Ore no Imouto ga Konnani Kawaii Wake ga Nai.
- Ore no Imouto ga Konnani Kawaii Wake ga Nai. Specials
- Ore no Kanojo to Osananajimi ga Shuraba Sugiru
- Ore no Nounai Sentakushi ga, Gakuen Love Comedy wo Zenryoku de Jama Shiteiru
- Ore no Yubi de Midarero.: Heitengo Futarikiri no Salon de...
- 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, Twintail ni Narimasu.
- Orenchi no Furo Jijou
- Oretachi ni Tsubasa wa Nai: Under the Innocent Sky.
- Orient
- Oruchuban Ebichu
OT
- Otaku no Video
- Otogizoushi
- Otome Chibaku Yuugi
- Otome Dori
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta...
- Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... X
- Otome Game Sekai wa Mob ni Kibishii Sekai desu
- Otome wa Boku ni Koishiteru
- Otome Youkai Zakuro
- Otona Joshi no Anime Time
- Otonari ni Ginga
- Otonari no Tenshi-sama ni Itsunomanika Dame Ningen ni Sareteita Ken
OU
OZ