| 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 Kid | June 2006 | Korean Broadcasting System | 26 |
| Iron Man | September 24, 1994 | Broadcast syndication | 26 |
| Iron Man | July 23, 2010 | — | — |
| Iron Man and His Awesome Friends | August 11, 2025 | Disney Jr. | 19 |
| Iron Man: Armored Adventures | March 14, 2009 | France 4 | 52 |
| 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 |
| Isadora Moon | November 17, 2023 | Sky Kids | — |
| Isekai Cheat Magician | July 10, 2019 | — | 12 |
| Isekai Izakaya "Nobu" | — | — | — |
| 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 |
| It's a Pet's World | September 6, 1999 | France 3 | 52 |
| It's a Small World: The Animated Series | November 26, 2013 | — | — |
| It's Pony | January 18, 2020 | Nickelodeon, YTV, Nickelodeon | 11 |
| It's Punky Brewster | September 14, 1985 | NBC | 26 |
| It's the Wolf | — | — | — |
| 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 | — |
| Itsy Bitsy Spider | 1994 | USA Network | 26 |
| It’s Andrew! | December 5, 2025 | Canadian Broadcasting Corporation, ABC Kids | — |
| Ivan's Infinite Imagination | June 1, 2026 | — | 3 |
| Ivanhoe | — | — | — |
| Ivor the Engine | 1959 | ITV | — |
| Iwa-Kakeru! Sport Climbing Girls | October 4, 2020 | — | 12 |
| Iwájú | February 28, 2024 | Disney+ | 6 |
| 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 |
| Jabberjaw | September 11, 1976 | American Broadcasting Company | 16 |
| Jacek śpioszek | 1962 | TVP1 | 13 |
| Jack-of-All-Trades, Party of None | January 4, 2026 | — | 12 |
| Jackie Chan Adventures | September 9, 2000 | The WB, Pro Cinema | 95 |
| Jackson 5ive | September 11, 1971 | American Broadcasting Company | 23 |
| Jacob Two-Two | September 7, 2003 | YTV | 62 |
| Jade Armor | — | — | — |
| Jade Dynasty | — | — | — |
| Jake and the Never Land Pirates | February 14, 2011 | Disney Channel, Disney Jr. | 104 |