| Mr. Bean: The Animated Series | January 5, 2002 | ITV1 | 130 |
| Mr. Bogus | January 1, 1991 | Broadcast syndication | 58 |
| Mr. Freeman | March 6, 2010 | 2×2 | 17 |
| Mr. Hiccup | 1983 | — | 39 |
| Mr. Magoo | May 4, 2019 | — | 78 |
| Mr. Osomatsu | October 5, 2015 | — | 25 |
| Mr. Pickles | September 21, 2014 | Adult Swim | 20 |
| Mr. Stain on Junk Alley | January 6, 2003 | — | 14 |
| Mr. Tonegawa: Middle Management Blues | July 4, 2018 | Nippon Television | 24 |
| Mr. Villain's Day Off | January 8, 2024 | — | 12 |
| Mr. Wong | 2000 | — | 15 |
| Mrs. Pepper Pot | April 4, 1983 | NHK General TV | 130 |
| Ms. Black-Rose's Stationery Store | — | MBC TV | 52 |
| Ms. Isshiki Wants to Know About Love | January 2027 | — | — |
| Ms. Koizumi Loves Ramen Noodles | January 4, 2018 | AT-X | 12 |
| Ms. Vampire Who Lives in My Neighborhood | October 5, 2018 | AT-X | 12 |
| Muddle Earth | March 15, 2010 | CBBC | 26 |
| Muddy the Little Master | — | Golden Eagle Cartoon | 26 |
| Muka Muka Paradise | September 4, 1993 | — | — |
| Mulligan | May 12, 2023 | Netflix | 10 |
| Multi-Mind Mayhem | January 2027 | — | — |
| Multirussia | 2006 | Channel One Russia, Carousel | — |
| Mummies Alive! | September 15, 1997 | Broadcast syndication | 42 |
| Mummy Nanny | April 17, 2001 | France 2, Super RTL, Canal J | 26 |
| Muppet Babies | March 23, 2018 | Disney Jr. | 89 |
| Murai in Love | October 6, 2024 | — | 12 |
| Murciélago | January 2027 | — | — |
| Murder Drones | 2021 | YouTube | — |
| Murder Mystery of the Dead | November 13, 2024 | Tokyo MX | 6 |
| Muromi-san | April 7, 2013 | — | 13 |
| Musashi Gundoh | 2006 | — | 26 |
| Musashi no Ken | April 18, 1985 | TV Tokyo | 72 |
| Musashi, the Samurai Lord | October 3, 1990 | Nippon Television | — |
| Musasino! | July 2, 2022 | — | — |
| Mush-Mush & the Mushables | October 17, 2020 | Piwi+ | 50 |
| Mushi-Uta | July 6, 2007 | WOWOW | — |
| Mushibugyō | April 8, 2013 | — | 26 |
| Mushibugyō | July 18, 2014 | — | — |
| Mushishi | October 23, 2005 | Tokyo MX | 46 |
| Mushoku Tensei | January 11, 2021 | — | 48 |
| Music Up | — | — | — |
| Musumet | October 4, 2004 | — | 13 |
| Mutant Turtles: Superman Legend | — | — | — |
| Muteking the Dancing Hero | October 3, 2021 | — | 12 |
| Muteking, The Dashing Warrior | September 7, 1980 | Fuji Television | 56 |
| Mutsu Enmei-ryū Gaiden: Shura no Toki | April 6, 2004 | TV Tokyo | 26 |
| Muv-Luv Alternative | October 7, 2021 | — | 24 |
| Muv-Luv Alternative: Total Eclipse | July 2, 2012 | — | 24 |
| Muzik Tiger In the Forest | April 2, 2025 | — | — |
| My Adventures with Superman | July 7, 2023 | Adult Swim | 30 |
| My Awkward Senpai | October 2, 2025 | — | 12 |
| My Big Big Friend | 2010 | Treehouse TV, Discovery Kids | 52 |
| My Bride Is a Mermaid | April 1, 2007 | — | 26 |
| My Bride Is a Mermaid | — | — | — |
| My Brother the Minotaur | April 24, 2026 | Apple TV | — |
| My Clueless First Friend | April 9, 2023 | — | 13 |
| My Crush's Crush | — | — | — |
| My Dad the Bounty Hunter | February 9, 2023 | Netflix | 20 |
| My Dad the Rock Star | September 1, 2003 | Nickelodeon, Télétoon | 26 |
| My Daddy Long Legs | January 14, 1990 | — | 40 |