| Kid vs. Kat | October 25, 2008 | YTV | 52 |
| Kid-E-Cats | October 24, 2015 | STS | 208 |
| Kiff | March 10, 2023 | Disney Channel | 60 |
| Kiki & Nuna | — | CCTV-14 Children | 104 |
| KikoRiki | May 17, 2004 | YouTube, TV Rain, Russia-1, Channel One Russia, Channel 31, STS, Russia-K, Domashny, Kinopoisk, Inter, Mir, K2+7 | 218 |
| Kikoriki: New Adventures | — | — | — |
| Kikoriki: PIN-Code | April 7, 2012 | Channel One Russia, Carousel, TET | 88 |
| Kill Dim | — | — | — |
| Kim | — | — | — |
| Kim & Jim's Wormhole | — | — | 26 |
| Kim Possible | June 7, 2002 | Disney Channel | 87 |
| Kindergarten: The Musical | September 3, 2024 | Disney Jr. | 15 |
| King Arthur & the Knights of Justice | September 13, 1992 | Broadcast syndication | 26 |
| King Arthur's Disasters | April 11, 2005 | CITV | 26 |
| King Leonardo and His Short Subjects | October 15, 1960 | NBC | 182 |
| King of the Hill | January 12, 1997 | Fox Broadcasting Company, Adult Swim | 259 |
| King Star King | November 3, 2013 | Adult Swim | 6 |
| Kingdom Force | December 7, 2019 | ICI Radio-Canada Télé, CBC Kids | 26 |
| Kipo and the Age of Wonderbeasts | January 14, 2020 | Netflix | 30 |
| Kipper | September 5, 1997 | Walt Disney Television | 78 |
| Kiri and Lou | — | — | — |
| Kissyfur | September 13, 1986 | NBC | 46 |
| Kite Man: Hell Yeah! | July 18, 2024 | HBO Max | 10 |
| Kitti Katz | May 18, 2023 | Netflix | 10 |
| Kiya & the Kimoja Heroes | March 22, 2023 | Disney Jr. | 26 |
| Kleine Isar | November 8, 1980 | Nederlandse Christelijke Radio Vereniging | 18 |
| Kleiner Dodo | 2007 | — | 26 |
| Klondike Kat | September 10, 1966 | — | 26 |
| Klump | 2018 | — | — |
| Klutter! | September 9, 1995 | Fox Broadcasting Company, Fox Kids | 8 |
| Koala Man | January 9, 2023 | Hulu | 8 |
| Koki | 1997 | — | — |
| Kom We Gaan | January 2, 2005 | VPRO | 11 |
| Komi Witch Lara | — | Tooniverse | — |
| 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 |
| Koongya Koongya | — | — | 26 |
| Kral Şakir | May 16, 2016 | Cartoon Network | 283 |
| Krapopolis | September 24, 2023 | Fox Broadcasting Company | 58 |
| Krypto the Superdog | March 25, 2005 | Cartoon Network | 39 |
| Kukuli | — | — | — |
| 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 | — | — |
| Kunshikter | 2023 | — | 13 |
| Kuu Kuu Harajuku | November 1, 2015 | Nickelodeon, Nick Jr. Channel, 10 Comedy | 78 |
| L'isola del Tesoro | November 22, 2016 | — | — |
| La familia del barrio | — | — | 94 |
| La Linea | 1972 | RAI | 90 |
| Lady Lovely Locks | April 4, 1987 | — | 20 |
| Laff-A-Lympics | September 10, 1977 | American Broadcasting Company | 24 |
| Laku noć | February 8, 2005 | Nova TV | — |
| Lalaloopsy | March 29, 2013 | Nickelodeon, Nick Jr. Channel | 52 |
| Lamput | 2017 | Cartoon Network | 147 |
| Lance Dur | March 1, 2023 | Animation Digital Network | 7 |