| Komi Can't Communicate | October 6, 2021 | TV Tokyo | 24 |
| Komi Witch Lara | — | Tooniverse | — |
| Komori-san Can't Decline | October 4, 2015 | — | 12 |
| Kon'nichiwa Anne: Before Green Gables | April 5, 2009 | — | 39 |
| Kong: King of the Apes | April 15, 2016 | Netflix | 23 |
| Kong: The Animated Series | May 26, 2001 | Fox Kids | 40 |
| Kongsuni | — | — | 52 |
| Koning Vollebol | October 14, 1964 | Katholieke Radio Omroep | 20 |
| 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 |
| Koongya Koongya | — | — | 26 |
| Koro Sensei Quest! | December 23, 2016 | — | 12 |
| Koroshiya-san | October 10, 2013 | — | 10 |
| Kotaro Lives Alone | March 10, 2022 | Netflix | 10 |
| Kotencotenco | October 6, 2005 | — | 52 |
| Kotoura-san | January 11, 2013 | — | 12 |
| Koukou Butouden Crows | January 28, 1994 | — | 2 |
| KOWABON | October 4, 2015 | — | 13 |
| Kowloon Generic Romance | April 5, 2025 | — | — |
| Koyomimonogatari | January 10, 2016 | — | 12 |
| Kral Şakir | May 16, 2016 | Cartoon Network | 283 |
| Krapopolis | September 24, 2023 | Fox Broadcasting Company | 58 |
| Krogzilla | May 31, 2012 | — | 10 |
| Krypto the Superdog | March 25, 2005 | Cartoon Network | 39 |
| Kubikiri Cycle: Aoiro Savant to Zaregotozukai | October 26, 2016 | — | 8 |
| Kubo Won't Let Me Be Invisible | January 10, 2023 | — | 12 |
| Kud | May 24, 2006 | TMF Nederland | — |
| Kujibiki Unbalance | December 22, 2004 | — | 3 |
| Kujibiki Unbalance | October 6, 2006 | Kids Station | 12 |
| Kujima: Why Sing, When You Can Warble? | April 9, 2026 | — | 12 |
| Kukuli | — | — | — |
| Kum-Kum | October 3, 1975 | MBS | 26 |
| Kuma Kuma Kuma Bear | October 7, 2020 | — | 24 |
| Kuma Miko: Girl Meets Bear | April 3, 2016 | — | 12 |
| Kung Fu Dino Posse | October 2, 2010 | KBS 1TV | 40 |
| Kung Fu Panda: Legends of Awesomeness | September 19, 2011 | Nickelodeon | 80 |
| Kung Fu Panda: The Dragon Knight | July 14, 2022 | Netflix | 42 |
| Kung Fu Panda: The Paws of Destiny | 2018 | Amazon Prime Video | 26 |
| Kung-Foot | — | TF1 | 26 |
| Kungfood | 2014 | — | — |
| Kunimatsu-sama no Otoridai | October 6, 1971 | — | 46 |
| Kunoichi Bakumatsu Kitan | — | — | — |
| Kunon the Sorcerer Can See | January 4, 2026 | — | 13 |
| Kunshikter | 2023 | — | 13 |
| Kurau Phantom Memory | June 24, 2004 | — | 24 |
| Kure-nai | April 3, 2008 | — | 12 |
| Kure-nai | July 2, 2010 | — | 2 |
| Kurogane Communication | October 5, 1998 | — | 24 |
| Kurokami: The Animation | January 8, 2009 | TV Asahi | 23 |
| Kurokan | — | — | — |
| Kuroko's Basketball | April 7, 2012 | — | 75 |
| Kuromajo-san ga Toru!! | April 4, 2012 | NHK Educational TV | 60 |
| Kuromi's Pretty Journey | February 17, 2023 | — | 21 |
| Kuromukuro | April 7, 2016 | — | 26 |
| Kurozuka | October 7, 2008 | Animax | 12 |
| Kuruneko | July 5, 2009 | — | 100 |