| Aburakawa Nobue Yashiki | | 2022 | Fuefuki |
| Ahoyama Castle | | 2024 | Otsu |
| Aida Yakata | | 2022 | Matsumoto |
| Aika Yashiki | | 2025 | Iwata |
| Aiki Castle (Minochi) | Trenches | 2020 | Nagano |
| Aimiyamamonomi Fort | | 2022 | Tatsuno |
| Ainuta Fort | | 2022 | Nirasaki |
| Aizu Wakamatsu Castle | Samurai homes
Main keep
Walls
Turrets
Water moats
Gates
Bridges
Stone walls | 1999 | Aizu Wakamatsu |
| Akagi Kita Castle | Trenches | 2020 | Matsumoto |
| Akagi Minami Castle | Trenches | 2020 | Matsumoto |
| Akagi Yakata | | 2021 | Matsumoto |
| Akahori Castle (Ise) | | 2025 | Yokkaichi |
| Akaiwa Castle | Trenches | 2025 | Toyohashi |
| Akasaka Jin'ya | Gates | 2023 | Toyokawa |
| Akashi Castle | Walls
Turrets
Water moats
Gates
Stone walls | 2007 | Akashi |
| Akashibu Castle (Mikawa) | | 2023 | Okazaki |
| Akasu Castle (Ina) | Trenches | 2020 | Komagane |
| Akatsuka Castle | Trenches | 2020 | Tokyo |
| Akayama Jin'ya | Trenches | 2023 | Kawaguchi |
| Akazawa Yakata | | 2022 | Matsumoto |
| Akechi Castle | Trenches
Gates | 2025 | Ena |
| Akechi Jin'ya | Water moats
Castle town
Stone walls | 2025 | Ena |
| Akechi Osayama Castle | Trenches
Walls | 2021 | Kani |
| Aki Castle | Samurai homes
Water moats
Castle town
Stone walls | 2013 | Aki City |
| Akiba Fort (Azumi) | Trenches | 2023 | Hakuba |
| Akiba Fort (Ina) | | 2021 | Tatsuno |
| Akita Castle | Walls
Gates | 2012 | Akita City |
| Akiyama Yakata | | 2023 | Minami-Alps |
| Akiyoshi Fort | Trenches
Stone walls | 2023 | Matsumoto |
| Akizuki Castle | Trenches
Samurai homes
Walls
Castle town
Gates
Stone walls | 2009 | Asakura |
| Akizuki Domain South Detached Palace | Stone walls | 2020 | Asakura |
| Ako Castle | Samurai homes
Walls
Turrets
Water moats
Gates
Bridges
Stone walls | 2009 | Ako |
| Akozu Castle | Turrets | 2016 | Yurihonjo |
| Akutagawasan Castle | Trenches
Stone walls | 2013 | Takatsuki |
| Amabiki Castle | Trenches | 2022 | Takayama |
| Amaga Castle | Main keep
Walls
Turrets
Gates
Stone walls | 2012 | Takaoka-cho |
| Amagasaki Castle | Main keep
Walls
Turrets
Water moats
Stone walls | 2013 | Amagasaki |
| Amagata Castle | Trenches | 2025 | Mori |
| Amanari Castle | Trenches | 2023 | Fujikawa |
| Amari Yakata | | 2022 | Nirasaki |
| Amemiya Yashiki | | 2022 | Fuefuki |
| Ametoya Castle | Trenches | 2021 | Matsumoto |
| Amidadou Castle (Omi) | | 2022 | Higashi-Ōmi |
| Amidagamine Castle (Yamashiro) | Trenches | 2022 | Kyoto |
| Amino Shingozaemon Yashiki | Water moats | 2022 | Kōshū |
| Amino Yashiki | | 2022 | Kōshū |
| Anjou Jin'ya | | 2023 | Anjō |
| Annaka Castle | Samurai homes
Castle town
Gates | 2018 | Annaka |
| Ano Yakata | | 2023 | Numazu |
| Anrakuji Yakata | Stone walls | 2021 | Azumino |
| Ansho Castle | Trenches | 2009 | Anjo |
| Anshouko Castle | | 2023 | Anjō |
| Aoiyama Castle | Trenches | 2023 | Obama |
| Aoki Castle (Azumi) | Trenches | 2021 | Ômachi |
| Aoki Castle (Sakata) | | 2022 | Maibara |
| Aono Castle (Mikawa) | | 2023 | Okazaki |
| Aoyagi Castle | Trenches
Walls
Turrets
Gates
Stone walls | 2016 | Chikuhokumura |
| Aoyagi Yakata | Stone walls | 2022 | Chikuhoku |
| Aoyama Castle | Trenches | 2015 | Ogawamachi |
| Aoyama Castle (Nagato) | Trenches
Stone walls | 2021 | Shimonoseki |
| Aoyama Castle (Omi) | Trenches | 2021 | Higashi-Oumi |
| Aoyama Yashiki (Mikawa) | | 2023 | Okazaki |
| Ara Castle (Ina) | Trenches | 2022 | Ina |
| Ara Castle (Murakami Clan Fort Network) | Trenches | 2021 | Ueda |
| Aragaito Fort | Trenches | 2020 | Matsumoto |
| Arahorinaiki Yashiki | | 2023 | Nagano |
| Arai Castle | | 2020 | Matsumoto |
| Araihara Castle | Trenches | 2023 | Takayama |
| Araino Castle (Mikawa) | | 2023 | Okazaki |
| Arako Castle | | 2020 | Nagoya |
| Arashi Castle | Trenches | 2020 | Shiojiri |
| Aratame Castle | Water moats | 2023 | Sakata |
| Arato Castle | Stone walls | 2008 | Chikuma |
| Aratoshou Castle | Trenches | 2021 | Chikuma |
| Arayama Castle | | 2019 | Nakanoto |
| Arikoyama Castle | Trenches
Samurai homes
Castle town
Stone walls | 2013 | Toyooka |
| Aruga Castle | Trenches | 2020 | Suwa |
| Asaba Castle | Trenches
Bridges | 2016 | Kanra |
| Asada Castle (Chikuma) | | 2020 | Matsumoto |
| Asahara Yakata | | 2022 | Higashi-Ōmi |
| Asahi Castle (Chikuma) | Trenches | 2019 | Asahi |
| Asahi Castle (Minochi) | | 2021 | Nagano |
| Asahi Castle (Owari) | Trenches
Main keep | 2019 | Owari-Asahi |
| Asahi Moated Settlement | Trenches | 2024 | Kiyosu |
| Asahiyama Castle | Trenches
Stone walls | 2021 | Nagano |
| Asahiyama Castle (Kai) | Trenches | 2022 | Hokuto |
| Asaka Castle (Chikuma) | Trenches
Stone walls | 2021 | Chikuhoku |
| Asakura Yakata | Trenches
Water moats
Gates
Stone walls | 2023 | Fukui |
| Asama Palace | Stone walls | 2021 | Matsumoto |
| Asama Yakata | | 2020 | Matsumoto |
| Asano Castle | Water moats | 2025 | Ichinomiya |
| Ashigara Castle | Trenches | 2010 | Oyama |
| Ashikaga Masauji Yakata | Trenches | 2023 | Kuki |
| Ashikagashi Yakata | Water moats
Gates | 2007 | Ashikaga |
| Ashimori Jin'ya | Samurai homes
Water moats
Castle town
Bridges
Stone walls | 2022 | Okayama |
| Ashinoya Jin'ya | Trenches
Walls
Palace
Gates
Stone walls | 2023 | Kōta |
| Asonuma Castle | Trenches | 2017 | Sano |
| Asou Castle (Mikawa) | Stone walls | 2024 | Okazaki |
| Asouko Castle (Mikawa) | | 2024 | Okazaki |
| Asukayama Castle | | 2022 | Tokyo |
