| Invincible Super Man Zambot 3 | October 8, 1977 | Nagoya Broadcasting Network | 23 |
| Ippatsu Kanta-kun | September 18, 1977 | — | 53 |
| Ippatsu Kiki Musume | October 5, 1999 | TBS Television | 16 |
| Ippon Again! | January 9, 2023 | — | 13 |
| Irina: The Vampire Cosmonaut | October 4, 2021 | — | 12 |
| Iriya no Sora, UFO no Natsu | February 25, 2005 | — | 6 |
| Irodorimidori | January 5, 2022 | — | 8 |
| Iroduku: The World in Colors | October 6, 2018 | — | 13 |
| Iron Man | July 23, 2010 | — | — |
| Iron Wok Jan | July 5, 2026 | TV Tokyo | 12 |
| Ironfist Chinmi | July 2, 1988 | — | 20 |
| Is It Wrong to Try to Pick Up Girls in a Dungeon? | April 4, 2015 | — | 74 |
| Is the Order a Rabbit? | April 10, 2014 | — | 36 |
| Is This a Zombie? | January 11, 2011 | — | 22 |
| Isabelle of Paris | April 19, 1979 | TV Tokyo | 13 |
| Isekai Cheat Magician | July 10, 2019 | — | 12 |
| Isekai Onsen Paradise | January 12, 2024 | — | 12 |
| Isekai Quartet | April 10, 2019 | Tokyo MX | 24 |
| Ishida & Asakura | January 6, 2013 | Tokyo MX | 12 |
| Ishura | January 3, 2024 | — | 24 |
| Island | July 1, 2018 | — | 12 |
| Isshoni Training | April 24, 2009 | — | 3 |
| Isuca | January 24, 2015 | — | 10 |
| Itadakiman | April 9, 1983 | Fuji Television | 20 |
| Itazura na Kiss | April 4, 2008 | — | 25 |
| Itazura Tenshi Chippo-chan | March 30, 1970 | — | 240 |
| Itsudatte Bokura no Koi wa 10 Centi Datta | November 25, 2017 | — | — |
| Itsumo Kokoro ni Taiyō o! | November 2, 1999 | TBS Television | — |
| Iwa-Kakeru! Sport Climbing Girls | October 4, 2020 | — | 12 |
| Ixion Saga DT | October 8, 2012 | — | — |
| Iya na Kao sare nagara Opantsu Misete Moraitai | — | — | — |
| Izetta: The Last Witch | October 1, 2016 | — | 12 |
| Izumo: Takeki Tsurugi no Senki | April 3, 2005 | TV Aichi | 12 |
| Jaadugar: A Witch in Mongolia | July 4, 2026 | TV Asahi | 12 |
| Jack-of-All-Trades, Party of None | January 4, 2026 | — | 12 |
| Jam the HOUSENAIL | — | — | 15 |
| Japan Sinks: 2020 | — | — | — |
| Jarinko Chie | October 3, 1981 | — | 64 |
| Jeanie with the Light Brown Hair | October 15, 1992 | — | 52 |
| Jellyfish Can't Swim in the Night | April 7, 2024 | — | 12 |
| Jetter Mars | February 3, 1977 | — | 27 |
| Jewelpet | April 5, 2009 | TV Tokyo | 52 |
| Jewelpet Twinkle | April 3, 2010 | — | 52 |
| Jewelpet: Magical Change | April 5, 2009 | — | 39 |
| Jibaku-kun: Twelve Worlds Story | October 5, 1999 | — | 26 |
| Jigoku Sensei Nūbē | April 13, 1996 | Animax | 49 |
| Jigoku Sensei Nūbē | June 12, 1998 | — | — |
| Jigoku Sensei Nūbē | July 2, 2025 | — | — |
| Jim Button and Luke the Engine Driver | October 4, 1974 | MBS | — |
| Jimoto Saiko! | — | — | — |
| Jing: King of Bandits | May 15, 2002 | NHK Satellite 2 Television | 16 |
| Jingai-san no Yome | October 2, 2018 | — | 12 |
| Jingi | — | — | — |
| Jinki: Extend | January 5, 2005 | TV Asahi | 13 |
| Jinsei | July 6, 2014 | — | 13 |
| JK-Meshi! | October 6, 2015 | Tokyo MX | 26 |
| JoJo's Bizarre Adventure | November 19, 1993 | — | 13 |
| JoJo's Bizarre Adventure | October 6, 2012 | — | — |
| Joker Game | April 5, 2016 | — | — |
| Joran: The Princess of Snow and Blood | April 7, 2021 | — | 12 |