| Johnny Bravo | July 7, 1997 | Cartoon Network | 65 |
| Johnny Cypher in Dimension Zero | October 21, 1968 | Broadcast syndication | 131 |
| Johnny Test | September 17, 2005 | The CW, Cartoon Network, The WB, Cartoon Network, CITV | 117 |
| JoJo's Circus | September 28, 2003 | Disney Channel | 59 |
| Jokebook | April 23, 1982 | NBC | 7 |
| Joker: Laugh Riot | — | — | — |
| Jokie | — | RTL Telekids | 52 |
| Jonny Quest | September 18, 1964 | American Broadcasting Company | 39 |
| Joobi the Fantastic Fox | — | SBS TV | 26 |
| Joodyssey | — | KBS 1TV | — |
| Josie and the Pussycats | September 12, 1970 | CBS | 16 |
| José Totoy | — | — | 50 |
| Journey of Long | — | KBS 1TV | — |
| Julius Jr. | September 29, 2013 | Disney Jr. | 52 |
| Jumanji | September 8, 1996 | UPN Kids, Bohbot Kids Network | 40 |
| Jungle Box | — | Tooniverse | — |
| Jungle Cubs | October 5, 1996 | American Broadcasting Company | 21 |
| Jungle Junction | October 5, 2009 | Disney Jr. | 46 |
| Jungledyret Hugo | October 4, 2003 | TV 2 Danmark | 13 |
| Jurassic War | — | MBC TV | 26 |
| Jurassic World Camp Cretaceous | September 18, 2020 | — | 49 |
| Jurassic World: Chaos Theory | May 24, 2024 | — | 39 |
| Justice League | November 17, 2001 | Cartoon Network | 52 |
| Justice League Action | December 16, 2016 | Cartoon Network | 52 |
| Justice League Unlimited | July 31, 2004 | Cartoon Network, Toonami | 39 |
| Justin Time | September 22, 2011 | PBS, UniMás, NBC Kids, Qubo, Sprout | 26 |
| Jája and Pája | — | — | 26 |
| Jómadarak | — | — | — |
| KaBlam! | October 1, 1996 | Nickelodeon | 47 |
| Kaeloo | June 6, 2010 | — | 202 |
| Kaijudo | June 2, 2012 | — | 52 |
| Kalles klätterträd | December 25, 1975 | SVT2 | — |
| Kambu | — | — | 52 |
| Kamp Koral: SpongeBob's Under Years | March 4, 2021 | Nickelodeon | 26 |
| Kangaroo Creek Gang | April 1, 2002 | Nine Network | 26 |
| Kangoo | 1996 | TF1 | 65 |
| Kangoo Juniors | — | TF1 | 104 |
| Kapitan Bomba | — | 4fun.tv | 164 |
| Kaput & Zösky | September 2, 2002 | Nicktoons | 26 |
| Karate Kommandos | September 15, 1986 | Boomerang | 5 |
| Kargin Multer | — | — | — |
| Karlsson on the Roof | 2002 | SVT1 | 26 |
| Karma's World | October 15, 2021 | Netflix | — |
| Kassai and Luk | April 30, 1997 | France 2 | 26 |
| Kasztaniaki | — | TVP2 | — |
| Kate & Mim-Mim | September 1, 2014 | CBeebies, BBC Kids, Knowledge Kids | 49 |
| Katie and Orbie | 1994 | Family Channel | 78 |
| Katz Fun | — | Cartoon Network | 39 |
| Kayko and Kokosh | February 28, 2021 | — | 5 |
| Keluang Man | — | TV1 | 142 |
| Keluarga Somat | June 8, 2013 | — | — |
| Kemy Expedition | — | — | — |
| Kevin Spencer | March 1, 1999 | CTV Comedy Channel | 113 |
| Khushi - The Princess of the Jungle | — | — | — |
| Kick Buttowski: Suburban Daredevil | February 13, 2010 | Disney XD | 52 |
| 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 |