| Infinity Train | August 5, 2019 | Adult Swim, HBO Max | 40 |
| Insektors | 1994 | Canal+ | 26 |
| Itsy Bitsy Spider | 1994 | USA Network | 26 |
| Jade Armor | — | — | — |
| Jelly, Ben & Pogo | — | — | — |
| Jim Button | August 26, 1999 | KiKA | 52 |
| Johnny Test | September 17, 2005 | The CW, Cartoon Network, The WB, Cartoon Network, CITV | 117 |
| Journey of Long | — | KBS 1TV | — |
| Jumanji | September 8, 1996 | UPN Kids, Bohbot Kids Network | 40 |
| Jungle Cubs | October 5, 1996 | American Broadcasting Company | 21 |
| Jurassic War | — | MBC TV | 26 |
| KaBlam! | October 1, 1996 | Nickelodeon | 47 |
| Kamp Koral: SpongeBob's Under Years | March 4, 2021 | Nickelodeon | 26 |
| Kate & Mim-Mim | September 1, 2014 | CBeebies, BBC Kids, Knowledge Kids | 49 |
| Kayko and Kokosh | February 28, 2021 | — | 5 |
| Kid vs. Kat | October 25, 2008 | YTV | 52 |
| King Arthur & the Knights of Justice | September 13, 1992 | Broadcast syndication | 26 |
| Kipo and the Age of Wonderbeasts | January 14, 2020 | Netflix | 30 |
| Lance Dur | March 1, 2023 | Animation Digital Network | 7 |
| Lavender Castle | January 7, 1999 | ITV | 26 |
| Legend of the Dragon | July 29, 2005 | BBC Children's and Education | 39 |
| Legends of Chima | January 16, 2013 | Cartoon Network | 40 |
| Lego Elves: Secrets of Elvendale | September 1, 2017 | — | — |
| Les Aventures de Colargol | 1968 | ORTF Télévision 2 | 53 |
| Lilo & Stitch: The Series | September 20, 2003 | Disney Channel | 65 |
| Little Dreamer Gguda | — | KBS 1TV | — |
| Little Einsteins | October 9, 2005 | Playhouse Disney, Disney Channel | 67 |
| Littlest Pet Shop | November 10, 2012 | TF1 | 104 |
| Lloyd in Space | February 3, 2001 | American Broadcasting Company | 39 |
| Lost in Oz | June 26, 2015 | Amazon Prime Video | 26 |
| Love Between Fairy and Devil | June 21, 2022 | IQIYI | 24 |
| Love, Death & Robots | March 15, 2019 | Netflix | 26 |
| Luo Bao Bei | — | — | 52 |
| Maggie and the Ferocious Beast | August 26, 2000 | Cartoon Network | 39 |
| Magiki | — | — | — |
| Mao Mao: Heroes of Pure Heart | July 1, 2019 | Cartoon Network | 40 |
| Martin Mystery | October 1, 2003 | Rai 2, YTV, M6 | 66 |
| Marvel's Avengers Assemble | May 26, 2013 | Disney XD | 127 |
| Marvin the Tap-Dancing Horse | March 5, 2000 | Cartoon Network, PBS Kids | 26 |
| Masters of the Universe: Revelation | July 23, 2021 | Netflix | 15 |
| Maya and the Three | October 22, 2021 | Netflix | 9 |
| Mickey's Mouse Tracks | November 2, 1992 | — | — |
| Mira, Royal Detective | March 20, 2020 | Disney Jr. | 54 |
| Miraculous: Tales of Ladybug & Cat Noir | September 1, 2015 | TF1, EBS 1TV | 183 |
| Moby Dick and Mighty Mightor | September 9, 1967 | CBS | 18 |
| Monster High | October 6, 2022 | Nickelodeon | 33 |
| Monster List | — | Bilibili, IQIYI, Tencent Video | — |
| Monster Math Squad | May 7, 2012 | CBC Kids | 50 |
| Monsuno | February 23, 2012 | Nicktoons | 65 |
| Moomin | April 12, 1990 | TV Tokyo | 104 |
| Moominvalley | 2019 | Yle | 26 |
| Mortal Kombat: Defenders of the Realm | September 21, 1996 | USA Network | 13 |
| Motown Magic | November 20, 2018 | Netflix | 25 |
| Mountain of Gems | 2005 | — | 71 |
| My Brother the Minotaur | April 24, 2026 | Apple TV | — |
| My Life as a Teenage Robot | August 1, 2003 | Nickelodeon | 40 |
| My Little Pony: Friendship Is Magic | October 10, 2010 | Discovery Family, Hub Network | 222 |
| Mysticons | August 28, 2017 | Nicktoons, Nickelodeon | 40 |
| Neo Yokio | September 22, 2017 | Netflix | 6 |
| Ninjago: Dragons Rising | June 1, 2023 | — | 40 |