| Knights of Sidonia | April 11, 2014 | — | 24 |
| Knyacki! | — | NHK Educational TV | — |
| Kobato | October 6, 2009 | NHK Satellite 2 Television | 24 |
| Kobo, the Li'l Rascal | October 19, 1992 | Nippon Television | 63 |
| Kocchi Muite! Miiko | February 14, 1998 | TV Asahi | 42 |
| KochiKame: Tokyo Beat Cops | 1996 | — | 367 |
| Kochoki | July 8, 2019 | — | 12 |
| Kodocha | April 5, 1996 | TV Tokyo | 102 |
| Kodomo no Jikan | October 12, 2007 | — | 12 |
| Kogepan | November 5, 2001 | — | 10 |
| Koi Kaze | April 1, 2004 | — | 13 |
| Koi Koi Seven | April 4, 2005 | — | 13 |
| Koi suru Tenshi Angelique | July 8, 2006 | — | — |
| Koihime Musō | July 9, 2008 | — | — |
| Koikimo | April 5, 2021 | — | 12 |
| Kokkoku | January 8, 2018 | — | 12 |
| Kokoro Connect | July 8, 2012 | — | 13 |
| Kokoro Library | October 12, 2001 | — | 13 |
| Komekami! Girls | April 8, 2026 | — | 12 |
| Komi Can't Communicate | October 6, 2021 | TV Tokyo | 24 |
| Komori-san Can't Decline | October 4, 2015 | — | 12 |
| Kon'nichiwa Anne: Before Green Gables | April 5, 2009 | — | 39 |
| Konna Ko Iru Kana | April 1986 | NHK | — |
| Kono Aozora ni Yakusoku o: Yōkoso Tsugumi Ryō e | April 4, 2007 | — | — |
| Kono Oto Tomare! Sounds of Life | April 6, 2019 | — | 26 |
| Konohana Kitan | October 4, 2017 | — | 12 |
| KonoSuba | January 13, 2016 | Tokyo MX | 31 |
| KonoSuba: An Explosion on This Wonderful World! | April 6, 2023 | — | 12 |
| Koro Sensei Quest! | December 23, 2016 | — | 12 |
| Koroshiya-san | October 10, 2013 | — | 10 |
| Kotencotenco | October 6, 2005 | — | 52 |
| Kotoura-san | January 11, 2013 | — | 12 |
| KOWABON | October 4, 2015 | — | 13 |
| Kowloon Generic Romance | April 5, 2025 | — | — |
| Kubo Won't Let Me Be Invisible | January 10, 2023 | — | 12 |
| Kujibiki Unbalance | October 6, 2006 | Kids Station | 12 |
| Kujima: Why Sing, When You Can Warble? | April 9, 2026 | — | 12 |
| Kum-Kum | October 3, 1975 | MBS | 26 |
| Kuma Kuma Kuma Bear | October 7, 2020 | — | 24 |
| Kuma Miko: Girl Meets Bear | April 3, 2016 | — | 12 |
| Kunimatsu-sama no Otoridai | October 6, 1971 | — | 46 |
| Kunon the Sorcerer Can See | January 4, 2026 | — | 13 |
| Kurau Phantom Memory | June 24, 2004 | — | 24 |
| Kure-nai | April 3, 2008 | — | 12 |
| Kurogane Communication | October 5, 1998 | — | 24 |
| Kurokami: The Animation | January 8, 2009 | TV Asahi | 23 |
| Kuroko's Basketball | April 7, 2012 | — | 75 |
| Kuromajo-san ga Toru!! | April 4, 2012 | NHK Educational TV | 60 |
| Kuromukuro | April 7, 2016 | — | 26 |
| Kurozuka | October 7, 2008 | Animax | 12 |
| Kuruneko | July 5, 2009 | — | 100 |
| Kusunoki's Flunking Her High School Glow-Up | — | — | — |
| Kusunoki's Garden of Gods | April 5, 2026 | — | 12 |
| Kyo Kara Maoh! | April 3, 2004 | NHK Satellite 2 Television | 117 |
| Kyoro-chan | July 1, 1999 | TV Tokyo | 91 |
| Kyoshin to Hyōka no Shiro | August 8, 2020 | Nagasaki Culture Telecasting | 4 |
| Kyousougiga | October 2, 2013 | — | 10 |
| Kyō no Go no Ni | October 5, 2008 | TV Tokyo | 13 |
| Kyōfu! Zombie Neko | October 2, 2015 | — | 52 |
| Kyōran Kazoku Nikki | April 12, 2008 | — | 26 |