| I'm the Villainess, So I'm Taming the Final Boss | October 1, 2022 | — | 12 |
| I've Been Killing Slimes for 300 Years and Maxed Out My Level | April 10, 2021 | — | 24 |
| I've Somehow Gotten Stronger When I Improved My Farm-Related Skills | October 1, 2022 | — | 12 |
| I, Elvis Riboldi | January 6, 2020 | — | 52 |
| I-Chu | January 6, 2021 | — | 12 |
| I.N.K. Invisible Network of Kids | 2010 | France 3 | 26 |
| Ice | May 25, 2007 | — | 3 |
| Ice Age: Scrat Tales | April 13, 2022 | Disney Channel, Disney+ | 6 |
| Ichigo Aika | January 5, 2026 | — | 12 |
| Ichijōma Mankitsu Gurashi! | April 12, 2026 | — | 12 |
| Iczer Girl Iczelion | January 27, 1995 | — | 2 |
| Iczer Reborn | September 25, 1990 | — | 6 |
| Id – Invaded | January 5, 2020 | — | 13 |
| ID-0 | April 9, 2017 | — | 12 |
| Idaten Jump | October 1, 2005 | — | 52 |
| Idol Angel Yokoso Yoko | April 2, 1990 | TV Setouchi | 43 |
| Idol Defense Force Hummingbird | September 1, 1993 | — | 4 |
| Idol Densetsu Eriko | April 3, 1989 | TV Setouchi | 51 |
| Idol Fairy Mongly | — | EBS 1TV | — |
| Idol Incidents | — | — | — |
| Idol Memories | October 3, 2016 | AT-X | — |
| Idol Time PriPara | April 4, 2017 | — | — |
| Idolish7 | December 31, 2017 | — | 62 |
| Idolls! | January 8, 2021 | — | 10 |
| IDOLM@STER SideM | October 1, 2017 | — | 13 |
| Idolmaster: Xenoglossia | April 4, 2007 | — | 26 |
| Idoly Pride | January 10, 2021 | — | 12 |
| If Her Flag Breaks | April 6, 2014 | — | 13 |
| If I See You in My Dreams | April 21, 1998 | — | 3 |
| If I See You in My Dreams | December 1, 1998 | — | 16 |
| If It's for My Daughter, I'd Even Defeat a Demon Lord | July 4, 2019 | — | 12 |
| If My Favorite Pop Idol Made It to the Budokan, I Would Die | January 10, 2020 | — | 12 |
| If You Give a Mouse a Cookie | — | — | 50 |
| Igano Kabamaru | October 20, 1983 | Nippon Television | 24 |
| IGPX | September 15, 2003 | — | — |
| Iii Icecrin | April 6, 2021 | — | 24 |
| Ikebukuro West Gate Park | October 6, 2020 | — | 12 |
| Ikemen Sengoku: Bromances Across Time | July 12, 2017 | — | 12 |
| Iketeru Futari | February 2, 1999 | TBS Television | 16 |
| Ikki Tousen | July 30, 2003 | — | 49 |
| Ikkyū-san | October 15, 1975 | TV Asahi | 296 |
| Ikkyū-san | April 10, 1978 | — | 26 |
| Ikusa Otome Valkyrie | December 24, 2004 | — | 2 |
| Ikusa Otome Valkyrie 2 | September 26, 2008 | — | 3 |
| Ikusa Otome Valkyrie G | July 20, 2012 | — | 2 |
| Ikusa Otome Valkyrie Shinshō | February 24, 2006 | — | 2 |
| Il mondo di Stefi | — | — | — |
| Imago | October 30, 2022 | TF1, Canal J | 26 |
| Imaizumin Chi wa Dōyara Gal no Tamariba ni Natteru Rashii | August 6, 2021 | — | 4 |
| Immoral Guild | October 5, 2022 | — | 12 |
| Immoral Sisters | April 27, 2001 | — | 3 |
| Immoral Sisters 2 | February 28, 2003 | — | 2 |
| Immoral Sisters: Blossoming | June 25, 2004 | — | 2 |
| IMP | May 3, 2006 | Cartoon Network | 65 |
| In a World Full of Zombies I'm the Only One Who Doesn't Get Attacked | January 2027 | — | — |
| In Another World With My Smartphone | July 11, 2017 | AT-X | 24 |
| In De Soete Suikerbol | September 1, 1973 | Nederlandse Omroep Stichting | 29 |
| In Search of Gods | March 25, 2026 | IQIYI | 24 |
| In Search of the Lost Future | October 4, 2014 | — | 12 |
| In the Beginning: The Bible Stories | November 30, 1992 | Rai 1, WOWOW | 26 |