| Arakawa Under the Bridge | April 4, 2010 | — | 26 |
| Arashi no Yoru ni: Himitsu no Tomodachi | April 4, 2012 | TV Tokyo | 26 |
| Arata: The Legend | April 8, 2013 | TV Tokyo | 12 |
| Arc the Lad | April 5, 1999 | WOWOW | 26 |
| Arcadia of My Youth: Endless Orbit SSX | October 13, 1982 | TBS Television | — |
| Arcanadea | — | — | — |
| Are You a Landmine, Chihara-san? | January 7, 2027 | — | — |
| Are You Lost? | July 2, 2019 | — | 12 |
| Area 88 | January 8, 2004 | — | 12 |
| Argento Soma | October 6, 2000 | TV Tokyo | 25 |
| Aria the Animation | October 5, 2005 | — | 13 |
| Aria the Natural | April 2, 2006 | — | 26 |
| Aria the Origination | January 8, 2008 | — | 13 |
| Aria the Scarlet Ammo | April 15, 2011 | — | 12 |
| Aria the Scarlet Ammo AA | October 6, 2015 | — | 12 |
| Arifureta | July 8, 2019 | — | 25 |
| Arknights | October 28, 2022 | — | 26 |
| Armed Girl's Machiavellism | April 5, 2017 | — | 12 |
| Armored Fleet Dairugger XV | March 3, 1982 | TV Tokyo | 52 |
| Armored Police Metal Jack | April 8, 1991 | — | 37 |
| Armored Trooper VOTOMS | April 1, 1983 | TV Tokyo | 52 |
| ARP Backstage Pass | January 13, 2020 | — | — |
| Arpeggio of Blue Steel -Ars Nova- | October 8, 2013 | — | 12 |
| Arrow Emblem: Hawk of the Grand Prix | September 22, 1977 | Fuji Television | 44 |
| Arte | April 4, 2020 | — | 12 |
| Aru Asa Dummy Head Mike ni Natteita Ore-kun no Jinsei | October 13, 2022 | — | 12 |
| As a Reincarnated Aristocrat, I'll Use My Appraisal Skill to Rise in the World | April 7, 2024 | — | 24 |
| As Miss Beelzebub Likes | October 11, 2018 | — | 12 |
| Asari-chan | January 25, 1982 | — | — |
| Asatir: Mirai No Mukashi Banashi | January 23, 2020 | — | — |
| Ascendance of a Bookworm | October 3, 2019 | — | 60 |
| 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 |
| Astarotte no Omocha! | April 10, 2011 | — | 12 |
| Asteroid in Love | January 3, 2020 | — | 12 |
| Astra Lost in Space | July 3, 2019 | — | 12 |
| Astro Boy | January 1, 1963 | Fuji Television | 193 |
| Astro Boy | April 6, 2003 | — | — |
| Astro Boy | October 1, 1980 | Cartoon Network | 52 |
| Astro Fighter Sunred | October 3, 2008 | — | 52 |
| Astro Note | April 5, 2024 | — | 12 |
| 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: The Beginning | April 15, 2017 | NHK General TV | 12 |
| Atri: My Dear Moments | July 14, 2024 | — | 13 |
| Attack No. 1 | December 7, 1969 | Fuji Television | 104 |
| 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 | — | — |