O — Seriler
- Obora Ichidai
- Odorobo Poruta
- Ogon no Bantam
- Ohayo Mimi-chan
- Okinawa
- Ole Golazo
- Omisore! Toraburikko
- One Man Army
- One Piece
- Oni ga Kitarite
- Onikko
- Onna Darake
- Onsen Boy
- Ore to Omae to Aitsu
- Ore wa Gebatetsu!
- Ore wa Kamikaze
- Ore wa Ryu
- Osama wa Roba: Hattari Teikoku no Gyakushu
- Otoboke Nasu-sensei
- Otoko Ippiki Gaki Daishou
- Otoko nara Shori no Uta wo
- Otoko No Joken
- Otoko no Tabidachi: Wild Adventure
- Otokozaka
- Otr of the Flame
- Oumagadoki Zoo
- Our Blood Oath
- Outer Leck
- Outer Zone
- Over Time
- Ozumo Deka