| Josephina the Whale | April 9, 1979 | — | — |
| Joshi Kausei | April 6, 2019 | — | — |
| Joshiraku | July 5, 2012 | — | 13 |
| Journal with Witch | January 4, 2026 | — | 13 |
| Jubei-chan 2: The Counterattack of Siberia Yagyu | January 7, 2004 | — | 13 |
| Jubei-chan: The Ninja Girl | April 5, 1999 | TV Tokyo | 13 |
| Juden Chan | June 25, 2009 | — | 12 |
| Judo Boy | April 2, 1969 | Fuji Television | 26 |
| Judo Sanka | April 1, 1974 | — | 27 |
| Jujutsu Kaisen | October 3, 2020 | TBS Television | 59 |
| Jungle de Ikou! | — | — | — |
| Jungle King Tar-chan | October 14, 1993 | TV Tokyo | — |
| Jungle Kurobe | March 2, 1973 | TV Asahi | 31 |
| Junji Ito Collection | January 5, 2018 | — | 12 |
| Junji Ito Crimson | — | — | — |
| Junji Ito Maniac: Japanese Tales of the Macabre | January 19, 2023 | Netflix | 6 |
| Junjō Romantica | April 10, 2008 | — | 36 |
| Junket Bank | — | TV Tokyo | — |
| Jura Tripper | April 2, 1995 | TV Tokyo | 39 |
| Jushin Liger | March 11, 1989 | TV Asahi, Nagoya Broadcasting Network | 43 |
| Just Because! | October 5, 2017 | — | 12 |
| Juuni Senshi Bakuretsu Eto Ranger | April 7, 1995 | NHK Satellite 2 Television | 39 |
| Juuni Taisen | October 2, 2017 | — | — |
| Jyu-Oh-Sei | April 13, 2006 | — | 11 |
| J⇔M | — | — | — |
| K | October 5, 2012 | — | 13 |
| K-On! | April 3, 2009 | TBS Television | — |
| K.O. Beast | — | — | 7 |
| Kabaneri of the Iron Fortress | April 8, 2016 | Fuji Television | — |
| Kabukibu! | April 6, 2017 | TBS Television | 12 |
| Kabuto Borg | December 5, 2006 | BS TV Tokyo | 52 |
| Kado: The Right Answer | April 7, 2017 | — | — |
| Kagaku Bōkentai Tansar 5 | July 27, 1979 | — | 34 |
| Kagaku Manga Survival | October 6, 2024 | NHK Educational TV | — |
| Kage Kara Mamoru! | January 7, 2006 | — | 12 |
| Kageki Shojo!! | July 4, 2021 | — | 13 |
| Kagewani | October 2, 2015 | — | 13 |
| Kagihime Monogatari Eikyū Alice Rondo | January 3, 2006 | — | 13 |
| Kaginado | October 12, 2021 | Tokyo MX | 24 |
| Kagurabachi | April 2027 | — | — |
| Kaguya-sama: Love is War | January 12, 2019 | — | 37 |
| Kaiba | April 11, 2008 | WOWOW | 12 |
| Kaibutsu-kun | April 21, 1968 | TBS Television | 49 |
| Kaidan Restaurant | — | — | — |
| Kaiji | October 3, 2007 | — | 51 |
| Kaiju Girl Caramelise | July 3, 2026 | — | 12 |
| Kaiju Girls | — | — | — |
| Kaiju No. 8 | April 13, 2024 | — | — |
| Kaiketsu Zorori | February 1, 2004 | — | 52 |
| Kaina of the Great Snow Sea | January 12, 2023 | Fuji Television | 11 |
| Kaitō Tenshi Twin Angel | September 18, 2008 | — | 2 |
| Kakegurui | July 1, 2017 | — | 24 |
| Kakegurui Twin | August 4, 2022 | Netflix | 6 |
| Kakuriyo: Bed & Breakfast for Spirits | April 2, 2018 | — | 26 |
| Kakushigoto | April 2, 2020 | — | 12 |
| Kakyuusei 2 | — | — | — |
| Kakyūsei | July 2, 1999 | — | 13 |
| Kakyūsei 2 | October 2, 2004 | — | 13 |
| Kaleido Star | April 4, 2003 | TV Tokyo | 51 |
| Kamen no Maid Guy | April 5, 2008 | — | 12 |