| Ki Fighter Taerang | August 21, 2002 | Munhwa Broadcasting Corporation | 26 |
| Kiba | April 2, 2006 | TV Tokyo | 51 |
| Kiko-chan's Smile | October 5, 1996 | TBS Television | 51 |
| King Arthur | September 9, 1979 | Fuji Television | 30 |
| King Arthur: Prince on White Horse | April 6, 1980 | Fuji Television | 22 |
| King's Proposal | 2027 | — | — |
| Kinkyū Hasshin Saver Kids | February 19, 1991 | — | 50 |
| Kino's Journey | April 8, 2003 | WOWOW | 13 |
| Kino's Journey: The Beautiful World - The Animated Series | October 6, 2017 | — | 12 |
| Knights of Sidonia | April 11, 2014 | — | 24 |
| Kon'nichiwa Anne: Before Green Gables | April 5, 2009 | — | 39 |
| KonoSuba | January 13, 2016 | Tokyo MX | 31 |
| KonoSuba: An Explosion on This Wonderful World! | April 6, 2023 | — | 12 |
| Kurogane Communication | October 5, 1998 | — | 24 |
| Kyo Kara Maoh! | April 3, 2004 | NHK Satellite 2 Television | 117 |
| Kōya no Shōnen Isamu | April 4, 1973 | Fuji Television | 52 |
| Last Exile | April 8, 2003 | TV Tokyo | 26 |
| Legend of Heavenly Sphere Shurato | April 6, 1989 | — | 38 |
| Legend of Himiko | January 7, 1999 | TV Tokyo | 12 |
| Lost Universe | April 3, 1998 | TV Tokyo | 26 |
| Lucifer and the Biscuit Hammer | July 9, 2022 | — | 24 |
| Lucy-May of the Southern Rainbow | January 10, 1982 | Fuji Television | 50 |
| Lupin the 3rd Part I | October 24, 1971 | Nippon Television Network System | 23 |
| Lupin the Third: The Woman Called Fujiko Mine | April 4, 2012 | — | 13 |
| Machine Robo Rescue | January 8, 2003 | TV Tokyo | 53 |
| Machine Robo: Battle Hackers | — | — | — |
| Machine Robo: Revenge of Cronos | July 3, 1986 | — | 47 |
| Macross 7 | October 16, 1994 | — | 49 |
| Macross Dynamite 7 | December 18, 1997 | — | 4 |
| Made in Abyss | July 7, 2017 | — | 13 |
| Madö King Granzört | April 7, 1989 | Nippon Television | — |
| Maetel Legend | November 1, 2000 | — | 2 |
| Maeterlinck's Blue Bird: Tyltyl and Mytyl's Adventurous Journey | January 9, 1980 | — | 26 |
| Magi: The Labyrinth of Magic | October 6, 2012 | — | 50 |
| Magical Girl Lyrical Nanoha | October 1, 2004 | — | 13 |
| Magical Girl Lyrical Nanoha A's | October 1, 2005 | — | 13 |
| Magical Girl Lyrical Nanoha ViVid | — | — | — |
| Magical Shopping Arcade Abenobashi | April 4, 2002 | — | 13 |
| Magne Robo Gakeen | September 5, 1976 | — | 39 |
| Maple Town | January 19, 1986 | TV Asahi | 52 |
| MapleStory | October 7, 2007 | TV Tokyo | 26 |
| Marine Boy | October 6, 1966 | Fuji Television, TBS Television | — |
| Martian Successor Nadesico | October 1, 1996 | TV Tokyo | 26 |
| Maya the Honey Bee | April 1, 1975 | TV Asahi | 104 |
| Medabots | July 2, 1999 | — | 52 |
| Mega Man Star Force | October 5, 2006 | TV Tokyo | — |
| Metal Armor Dragonar | February 7, 1987 | — | 48 |
| Miami Guns | February 5, 2000 | — | 13 |
| Mirai Shounen Conan II: Taiga Adventure | October 16, 1999 | TBS Television | 24 |
| Moldiver | February 25, 1993 | — | 6 |
| Mon Colle Knights | January 10, 2000 | TV Tokyo | 51 |
| Monkey Typhoon | October 1, 2002 | TV Tokyo | 52 |
| Monster Rancher | April 17, 1999 | — | 73 |
| Montana Jones | April 2, 1994 | NHK General TV | 52 |
| Mouse | January 6, 2003 | Chiba Television Broadcasting | 12 |
| Mushishi | October 23, 2005 | Tokyo MX | 46 |
| Mutant Turtles: Superman Legend | — | — | — |
| Muteking, The Dashing Warrior | September 7, 1980 | Fuji Television | 56 |
| My Isekai Life | July 4, 2022 | — | 12 |
| Mīmu Iro Iro Yume no Tabi | April 3, 1983 | TBS Television | 127 |