| It's a Small World: The Animated Series | November 26, 2013 | — | — |
| It's Punky Brewster | September 14, 1985 | NBC | 26 |
| It's the Wolf | — | — | — |
| Itsy Bitsy Spider | 1994 | USA Network | 26 |
| Ivan's Infinite Imagination | June 1, 2026 | — | 3 |
| Ivanhoe | — | — | — |
| Iwájú | February 28, 2024 | Disney+ | 6 |
| Jabberjaw | September 11, 1976 | American Broadcasting Company | 16 |
| Jackie Chan Adventures | September 9, 2000 | The WB, Pro Cinema | 95 |
| Jackson 5ive | September 11, 1971 | American Broadcasting Company | 23 |
| Jacob Two-Two | September 7, 2003 | YTV | 62 |
| Jake and the Never Land Pirates | February 14, 2011 | Disney Channel, Disney Jr. | 104 |
| Jakers! The Adventures of Piggley Winks | September 7, 2003 | PBS, CBeebies, PBS Kids | 52 |
| James Bond Jr. | September 16, 1991 | Broadcast syndication | 65 |
| Jeannie | September 8, 1973 | CBS | 16 |
| Jelly, Ben & Pogo | — | — | — |
| Jellystone! | July 29, 2021 | HBO Max | 30 |
| Jem | October 6, 1985 | Broadcast syndication | 65 |
| Jentry Chau vs. The Underworld | December 5, 2024 | — | 13 |
| Jessica's Big Little World | October 2, 2023 | Cartoon Network, Cartoonito | 20 |
| Jim and Judy in Teleland | September 1949 | — | 52 |
| Jim Henson's Muppet Babies | September 15, 1984 | CBS | 107 |
| Jimmy Neutron: Boy Genius Shorts | — | Nickelodeon | 12 |
| Jin Jin and the Panda Patrol | 1994 | — | 26 |
| Jodie | — | Comedy Central | — |
| 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 | — | — | — |
| Jonny Quest | September 18, 1964 | American Broadcasting Company | 39 |
| Josie and the Pussycats | September 12, 1970 | CBS | 16 |
| Julius Jr. | September 29, 2013 | Disney Jr. | 52 |
| Jumanji | September 8, 1996 | UPN Kids, Bohbot Kids Network | 40 |
| Jungle Cubs | October 5, 1996 | American Broadcasting Company | 21 |
| 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 |
| KaBlam! | October 1, 1996 | Nickelodeon | 47 |
| Kaijudo | June 2, 2012 | — | 52 |
| Kamp Koral: SpongeBob's Under Years | March 4, 2021 | Nickelodeon | 26 |
| Kaput & Zösky | September 2, 2002 | Nicktoons | 26 |
| Karate Kommandos | September 15, 1986 | Boomerang | 5 |
| Karma's World | October 15, 2021 | Netflix | — |
| Kick Buttowski: Suburban Daredevil | February 13, 2010 | Disney XD | 52 |
| Kid 'n Play | September 8, 1990 | NBC | 13 |
| Kid Cosmic | February 2, 2021 | Netflix | 24 |
| Kid Notorious | October 22, 2003 | Comedy Central | 9 |
| Kiff | March 10, 2023 | Disney Channel | 60 |
| 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 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 |
| Kipo and the Age of Wonderbeasts | January 14, 2020 | Netflix | 30 |
| Kipper | September 5, 1997 | Walt Disney Television | 78 |