| Arthur and the Children of the Round Table | September 15, 2018 | — | 52 |
| Arthur and the Minimoys | December 22, 2018 | Gulli | 26 |
| Arthur! and the Square Knights of the Round Table | 1966 | Australian Broadcasting Corporation | 35 |
| Aru Asa Dummy Head Mike ni Natteita Ore-kun no Jinsei | October 13, 2022 | — | 12 |
| Arzak Rhapsody | December 30, 2003 | France 2 | 14 |
| As a Reincarnated Aristocrat, I'll Use My Appraisal Skill to Rise in the World | April 7, 2024 | — | 24 |
| As Aventuras de Gui & Estopa | 2009 | Cartoon Network | 89 |
| As Aventuras do Bob Zoom | 2018 | — | 24 |
| As Miss Beelzebub Likes | October 11, 2018 | — | 12 |
| As Told by Ginger | October 25, 2000 | Nicktoons, Nickelodeon | 60 |
| Asari-chan | January 25, 1982 | — | — |
| Asatir: Mirai No Mukashi Banashi | January 23, 2020 | — | — |
| Ascendance of a Bookworm | October 3, 2019 | — | 60 |
| Asdfmovie | — | — | — |
| Ashita no Calendar | — | MBS | — |
| Ashita no Joe | April 1, 1970 | — | — |
| Ashita no Nadja | February 2, 2003 | — | 50 |
| Ashita Tenki ni Naare | October 6, 1984 | — | 47 |
| Ask Dr. Rin! | March 5, 2001 | TV Tokyo | 51 |
| Asobi Asobase | July 8, 2018 | — | 12 |
| Assassin's Pride | October 10, 2019 | — | 12 |
| Assassination Classroom | January 10, 2015 | — | 47 |
| Assault Lily Bouquet | October 2, 2020 | — | 13 |
| Assy McGee | November 26, 2006 | Adult Swim, Cartoon Network | 20 |
| Astarotte no Omocha! | April 10, 2011 | — | 12 |
| Asterix & Obelix: The Big Fight | May 30, 2025 | Netflix | 5 |
| Asteroid in Love | January 3, 2020 | — | 12 |
| Astra Lost in Space | July 3, 2019 | — | 12 |
| Astro and the Space Mutts | — | — | 11 |
| Astro Boy | January 1, 1963 | Fuji Television | 193 |
| Astro Boy | April 6, 2003 | — | — |
| Astro Boy | October 1, 1980 | Cartoon Network | 52 |
| Astro Farm | September 11, 1992 | CITV | 53 |
| Astro Fighter Sunred | October 3, 2008 | — | 52 |
| Astro Note | April 5, 2024 | — | 12 |
| Astro Plan | January 16, 2010 | — | 26 |
| Astroblast! | July 12, 2014 | Universal Kids | — |
| Astroganger | October 4, 1972 | Nippon Television Network System | 26 |
| Asura Cryin' | April 2, 2009 | — | 26 |
| Atashin'chi | April 19, 2002 | All-Nippon News Network | 330 |
| Atelier Escha & Logy: Alchemists of the Dusk Sky | April 10, 2014 | — | 12 |
| Atelier Ryza: Ever Darkness & the Secret Hideout | July 2, 2023 | — | 12 |
| Atom Ant | October 2, 1965 | NBC | 26 |
| Atom: The Beginning | April 15, 2017 | NHK General TV | 12 |
| Atomic Betty | August 29, 2004 | Cartoon Network, Cartoon Network, M6 | 78 |
| Atomic Forest | 2012 | 2×2 | 19 |
| Atomic Puppet | July 18, 2016 | Disney XD | 26 |
| Atri: My Dear Moments | July 14, 2024 | — | 13 |
| Attack No. 1 | December 7, 1969 | Fuji Television | 104 |
| Attack of the Killer Tomatoes | September 8, 1990 | Fox Broadcasting Company | 21 |
| Attack on Titan | April 7, 2013 | — | 88 |
| Attack on Titan: Junior High | October 4, 2015 | — | 12 |
| Attack on Tomorrow | April 4, 1977 | Fuji Television | 23 |
| Attacker You! | April 13, 1984 | — | — |
| Audrey's Shelter | — | — | 52 |
| Augie Doggie and Doggie Daddy | September 19, 1959 | — | 45 |
| Aura Battler Dunbine | February 5, 1983 | — | 49 |
| Aura Battler Dunbine: The Tale of Neo Byston Well | — | — | 3 |
| Avatar: Seven Havens | October 9, 2026 | Paramount+ | 13 |
| Avatar: The Last Airbender | February 21, 2005 | Nickelodeon | 61 |