| Ki Fighter Taerang | August 21, 2002 | Munhwa Broadcasting Corporation | 26 |
| Kiba | April 2, 2006 | TV Tokyo | 51 |
| Kick & Slide | July 7, 2021 | — | 12 |
| Kick Buttowski: Suburban Daredevil | February 13, 2010 | Disney XD | 52 |
| Kick no Oni | October 2, 1970 | — | 26 |
| Kick Off 2002 | February 18, 2002 | KBS 2TV, NHK Satellite 2 Television | 26 |
| Kid 'n Play | September 8, 1990 | NBC | 13 |
| Kid Clones | — | TF1 | — |
| Kid Cosmic | February 2, 2021 | Netflix | 24 |
| Kid Lucky | — | M6, M6 Kid, RaiPlay | — |
| Kid Notorious | October 22, 2003 | Comedy Central | 9 |
| Kid vs. Kat | October 25, 2008 | YTV | 52 |
| Kid-E-Cats | October 24, 2015 | STS | 208 |
| Kiddy Girl-and | October 15, 2009 | — | 24 |
| Kiddy Grade | October 8, 2002 | Fuji Television | 24 |
| Kids on the Slope | April 12, 2012 | — | 12 |
| Kiff | March 10, 2023 | Disney Channel | 60 |
| Kiitaro's Yokai Picture Diary | October 5, 2016 | — | 12 |
| Kikaider 01 The Animation | November 21, 2001 | — | 4 |
| Kiki & Nuna | — | CCTV-14 Children | 104 |
| Kiko-chan's Smile | October 5, 1996 | TBS Television | 51 |
| 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 Blue | April 11, 2026 | — | 12 |
| Kill Dim | — | — | — |
| Kill la Kill | October 4, 2013 | — | 24 |
| Kill Me Baby | January 5, 2012 | TBS Television | 13 |
| Killed Again, Mr. Detective? | April 3, 2026 | — | 12 |
| Killing Bites | January 13, 2018 | — | 12 |
| Kim | — | — | — |
| Kim & Jim's Wormhole | — | — | 26 |
| Kim Possible | June 7, 2002 | Disney Channel | 87 |
| Kimagure Orange Road | April 6, 1987 | Nippon Television | 48 |
| Kimagure Orange Road | March 1, 1989 | — | 8 |
| Kimba the White Lion | October 6, 1965 | Fuji Television | 52 |
| Kimi ga Aruji de Shitsuji ga Ore de | January 4, 2008 | — | 13 |
| Kimi ga Nozomu Eien: Next Season | December 21, 2007 | — | 4 |
| Kimi ni Todoke | October 6, 2009 | Nippon Television | 37 |
| Kimi to Boku | October 4, 2011 | TV Tokyo | 26 |
| Kimi to Fit Boxing | October 1, 2021 | Tokyo MX | 12 |
| KimiKiss: Pure Rouge | October 6, 2007 | — | 24 |
| Kin-iro Mosaic | July 6, 2013 | — | 24 |
| Kindergarten Wars | April 2027 | — | — |
| Kindergarten: The Musical | September 3, 2024 | Disney Jr. | 15 |
| King Arthur | September 9, 1979 | Fuji Television | 30 |
| King Arthur & the Knights of Justice | September 13, 1992 | Broadcast syndication | 26 |
| King Arthur's Disasters | April 11, 2005 | CITV | 26 |
| King Arthur: Prince on White Horse | April 6, 1980 | Fuji Television | 22 |
| 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 |
| King's Game The Animation | October 5, 2017 | — | 12 |
| King's Proposal | 2027 | — | — |
| King's Raid: Successors of the Will | October 3, 2020 | TV Tokyo | 26 |
| Kingdom | June 4, 2012 | NHK General TV | 77 |
| Kingdom Force | December 7, 2019 | ICI Radio-Canada Télé, CBC Kids | 26 |
| Kings of My Love | February 2011 | — | 14 |
| Kinkyū Hasshin Saver Kids | February 19, 1991 | — | 50 |
| Kinnikuman | April 3, 1983 | Nippon Television | 137 |