| The Little Polar Bear | 1992 | — | 21 |
| The Little Prince | December 24, 2010 | France 3 | 78 |
| The Little Prince and Friends | — | France 5 | 52 |
| The Little Rascals | September 25, 1982 | American Broadcasting Company | 22 |
| The Little Spudragon | February 1, 2022 | ICI Radio-Canada Télé | 15 |
| The Little Witch | — | — | 14 |
| The Little Witches | September 3, 1997 | TF1 | 26 |
| The Littles | September 10, 1983 | American Broadcasting Company | 29 |
| The Lone Ranger | September 10, 1966 | CBS | 26 |
| The Lonely Snow Widow and the Cursed Ring | October 5, 2026 | — | — |
| The Long Summer of August 31st | — | — | — |
| The Looney Tunes Show | May 3, 2011 | Cartoon Network | 52 |
| The Lost Village | April 2, 2016 | — | 12 |
| The Loud House | May 2, 2016 | Nickelodeon | 268 |
| The Magic Key | September 4, 2000 | BBC Two | 26 |
| The Magic of Chocolate | March 3, 2011 | — | 13 |
| The Magic Order | — | — | — |
| The Magic Reindeer – Tales from the Polar Circle | — | — | 13 |
| The Magic Roundabout | 1963 | Office de radiodiffusion télévision française | 750 |
| The Magic School Bus | September 10, 1994 | PBS, Qubo | 52 |
| The Magic School Bus Rides Again | September 29, 2017 | Netflix | 30 |
| The Magical Adventures of Quasimodo | 1996 | Family Channel | 26 |
| The Magical Girl and the Evil Lieutenant Used to Be Archenemies | July 9, 2024 | — | 12 |
| The Magical Revolution of the Reincarnated Princess and the Genius Young Lady | January 4, 2023 | — | 12 |
| The Magician | 1997 | France 3 | 39 |
| The Magilla Gorilla Show | 1964 | Broadcast syndication | 31 |
| The Magnificent Kotobuki | January 13, 2019 | — | 12 |
| The Maid I Hired Recently Is Mysterious | July 23, 2022 | — | 11 |
| The Many Sides of Voice Actor Radio | April 10, 2024 | — | 12 |
| The Marginal Service | April 12, 2023 | — | 12 |
| The Marshmallow Times | April 4, 2004 | TV Tokyo | 52 |
| The Marvel Super Heroes | September 1, 1966 | Broadcast syndication | 65 |
| The Marvelous Misadventures of Flapjack | June 5, 2008 | Cartoon Network | 46 |
| The Mask: Animated Series | August 12, 1995 | CBS | 54 |
| The Master of Ragnarok & Blesser of Einherjar | July 8, 2018 | — | 12 |
| The Masterful Cat Is Depressed Again Today | July 8, 2023 | MBS TV | 13 |
| The Mechnimals | — | — | — |
| The Melancholy of Haruhi Suzumiya | April 3, 2006 | — | 28 |
| The Merrie Melodies Show | — | Broadcast syndication | 24 |
| The Midnight Gospel | April 20, 2020 | Netflix | 8 |
| The Mighty B! | April 26, 2008 | Nickelodeon | 40 |
| The Mighty Hercules | September 1, 1963 | Broadcast syndication | 128 |
| The Mighty Heroes | October 29, 1966 | CBS | 20 |
| The Mighty Nein | November 19, 2025 | Amazon Prime Video | — |
| The Millionaire Detective - Balance: Unlimited | April 10, 2020 | Fuji Television | 11 |
| The Minimighty Kids | 2008 | TF1, Télétoon+ | 233 |
| The Misfit of Demon King Academy | July 4, 2020 | — | 25 |
| The Mojicons | October 19, 2015 | STS | 26 |
| The Monchhichis/Little Rascals/Richie Rich Show | September 10, 1983 | — | — |
| The Mononoke Lecture Logs of Chuzenji-sensei | April 7, 2025 | — | 12 |
| The Moomins | 1977 | TVP1 | 104 |
| The Moon on a Rainy Night | 2027 | — | — |
| The Morose Mononokean | June 28, 2016 | — | 26 |
| The Most Heretical Last Boss Queen | July 7, 2023 | — | 12 |
| The Most Notorious "Talker" Runs the World's Greatest Clan | October 7, 2024 | — | 12 |
| The Most Powerful Vendor | — | Bilibili | — |
| The Mouse and the Monster | 1996 | UPN | 13 |
| The Mouse Factory | 1972 | — | 43 |
| The Moxy Show | November 26, 1993 | Cartoon Network | 24 |
| The Mozart Band | 1995 | RTVE | 30 |