| | Contributor | Prefecture |
|---|
| Aburakawa Nobue Yashiki | ART | Yamanashi Prefecture |
| Ahoyama Castle | Eric | Shiga Prefecture |
| Aida Yakata | ART | Nagano Prefecture |
| Aika Yashiki | ART | Shizuoka Prefecture |
| Aiki Castle (Minochi) | ART | Nagano Prefecture |
| Aimiyamamonomi Fort | ART | Nagano Prefecture |
| Ainuta Fort | ART | Yamanashi Prefecture |
| Aizu Wakamatsu Castle | Eric | Fukushima Prefecture |
| Akagi Kita Castle | ART | Nagano Prefecture |
| Akagi Minami Castle | ART | Nagano Prefecture |
| Akagi Yakata | ART | Nagano Prefecture |
| Akahori Castle (Ise) | ART | Mie Prefecture |
| Akaiwa Castle | ART | Aichi Prefecture |
| Akasaka Jin'ya | ART | Aichi Prefecture |
| Akashi Castle | Eric | Hyogo Prefecture |
| Akashibu Castle (Mikawa) | ART | Aichi Prefecture |
| Akasu Castle (Ina) | ART | Nagano Prefecture |
| Akatsuka Castle | Eric | Tokyo |
| Akayama Jin'ya | Eric | Saitama Prefecture |
| Akazawa Yakata | ART | Nagano Prefecture |
| Akechi Castle | ART | Gifu Prefecture |
| Akechi Jin'ya | ART | Gifu Prefecture |
| Akechi Osayama Castle | ART | Gifu Prefecture |
| Aki Castle | | Kochi Prefecture |
| Akiba Fort (Azumi) | ART | Nagano Prefecture |
| Akiba Fort (Ina) | ART | Nagano Prefecture |
| Akita Castle | Frank T. | Akita Prefecture |
| Akiyama Yakata | ART | Yamanashi Prefecture |
| Akiyoshi Fort | ART | Nagano Prefecture |
| Akizuki Castle | Kyushudan | Fukuoka Prefecture |
| Akizuki Domain South Detached Palace | ART | Fukuoka Prefecture |
| Ako Castle | Eric | Hyogo Prefecture |
| Akozu Castle | ART | Akita Prefecture |
| Akutagawasan Castle | RaymondW | Osaka |
| Amabiki Castle | ART | Nagano Prefecture |
| Amaga Castle | Frank T. | Miyazaki Prefecture |
| Amagasaki Castle | Eric | Hyogo Prefecture |
| Amagata Castle | ART | Shizuoka Prefecture |
| Amanari Castle | ART | Yamanashi Prefecture |
| Amari Yakata | ART | Yamanashi Prefecture |
| Amemiya Yashiki | ART | Yamanashi Prefecture |
| Ametoya Castle | ART | Nagano Prefecture |
| Amidadou Castle (Omi) | ART | Shiga Prefecture |
| Amidagamine Castle (Yamashiro) | ART | Kyoto |
| Amino Shingozaemon Yashiki | ART | Yamanashi Prefecture |
| Amino Yashiki | ART | Yamanashi Prefecture |
| Anjou Jin'ya | ART | Aichi Prefecture |
| Annaka Castle | Eric | Gunma Prefecture |
| Ano Yakata | ART | Shizuoka Prefecture |
| Anrakuji Yakata | ART | Nagano Prefecture |
| Ansho Castle | Eric | Aichi Prefecture |
| Anshouko Castle | ART | Aichi Prefecture |
| Aoiyama Castle | ART | Fukui Prefecture |
| Aoki Castle (Azumi) | ART | Nagano Prefecture |
| Aoki Castle (Sakata) | ART | Shiga Prefecture |
| Aono Castle (Mikawa) | ART | Aichi Prefecture |
| Aoyagi Castle | Eric | Nagano Prefecture |
| Aoyagi Yakata | ART | Nagano Prefecture |
| Aoyama Castle | Eric | Saitama Prefecture |
| Aoyama Castle (Nagato) | ART | Yamaguchi Prefecture |
| Aoyama Castle (Omi) | ART | Shiga Prefecture |
| Aoyama Yashiki (Mikawa) | ART | Aichi Prefecture |
| Ara Castle (Ina) | ART | Nagano Prefecture |
| Ara Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Aragaito Fort | ART | Nagano Prefecture |
| Arahorinaiki Yashiki | ART | Nagano Prefecture |
| Arai Castle | ART | Nagano Prefecture |
| Araihara Castle | ART | Nagano Prefecture |
| Araino Castle (Mikawa) | ART | Aichi Prefecture |
| Arako Castle | ART | Aichi Prefecture |
| Arashi Castle | ART | Nagano Prefecture |
| Aratame Castle | ART | Yamagata Prefecture |
| Arato Castle | Eric | Nagano Prefecture |
| Aratoshou Castle | ART | Nagano Prefecture |
| Arayama Castle | ART | Ishikawa Prefecture |
| Arikoyama Castle | Eric | Hyogo Prefecture |
| Aruga Castle | ART | Nagano Prefecture |
| Asaba Castle | Eric | Gunma Prefecture |
| Asada Castle (Chikuma) | ART | Nagano Prefecture |
| Asahara Yakata | ART | Shiga Prefecture |
| Asahi Castle (Chikuma) | ART | Nagano Prefecture |
| Asahi Castle (Minochi) | ART | Nagano Prefecture |
| Asahi Castle (Owari) | ART | Aichi Prefecture |
| Asahi Moated Settlement | ART | Aichi Prefecture |
| Asahiyama Castle | ART | Nagano Prefecture |
| Asahiyama Castle (Kai) | ART | Yamanashi Prefecture |
| Asaka Castle (Chikuma) | ART | Nagano Prefecture |
| Asakura Yakata | Eric | Fukui Prefecture |
| Asama Palace | ART | Nagano Prefecture |
| Asama Yakata | ART | Nagano Prefecture |
| Asano Castle | ART | Aichi Prefecture |
| Ashigara Castle | Eric | Shizuoka Prefecture |
| Ashikaga Masauji Yakata | Eric | Saitama Prefecture |
| Ashikagashi Yakata | Eric | Tochigi Prefecture |
| Ashimori Jin'ya | ART | Okayama Prefecture |
| Ashinoya Jin'ya | ART | Aichi Prefecture |
| Asonuma Castle | Eric | Tochigi Prefecture |
| Asou Castle (Mikawa) | ART | Aichi Prefecture |
| Asouko Castle (Mikawa) | ART | Aichi Prefecture |
| Asukayama Castle | Eric | Tokyo |
| Asuke Castle | Furinkazan | Aichi Prefecture |
| Asuke Jin'ya | ART | Aichi Prefecture |
| Atagoyama Noroshidai | ART | Yamanashi Prefecture |
| Atsushiba Yashiki (Koma) | ART | Yamanashi Prefecture |
| Awaji Castle (Chikuma) | ART | Nagano Prefecture |
| Awaya Yakata | ART | Fukui Prefecture |
| Awazawa Castle (Suwa) | ART | Nagano Prefecture |
| Aya Castle | | Miyazaki Prefecture |
| Ayukawa Castle (Koka) | Eric | Shiga Prefecture |
| Azai Higashi Castle | ART | Aichi Prefecture |
| Azai Nishi Castle | ART | Aichi Prefecture |
| Azuchi Castle | Eric | Shiga Prefecture |
| Baba Noroshidai | ART | Yamanashi Prefecture |
| Baba Yashiki | ART | Nagano Prefecture |
| Baba Yashiki (Kai) | ART | Yamanashi Prefecture |
| Banba Castle | ART | Shiga Prefecture |
| Beffu Castle (Koka) | ART | Shiga Prefecture |
| Binmanji Castle | ART | Shiga Prefecture |
| Bitchu Matsuyama Castle | Eric | Okayama Prefecture |
| Bitchu Takamatsu Castle | Phibbyfan | Okayama Prefecture |
| Biwa Castle (Kai) | ART | Yamanashi Prefecture |
| Bizen Date (Uzen) | ART | Yamagata Prefecture |
| Bizenhara Yakata | ART | Nagano Prefecture |
| Bodaiyama Castle | ART | Gifu Prefecture |
| Bue Yakata (Totomi) | ART | Shizuoka Prefecture |
| Busetsu Castle | 豪谷 | Aichi Prefecture |
| Bushihara Fort | ART | Yamanashi Prefecture |
| Chamachi Battery (Obama Domain) | ART | Fukui Prefecture |
| Chausudate | Eric | Akita Prefecture |
| Chausuyama Castle (Chikuma) | ART | Nagano Prefecture |
| Chausuyama Castle (Nukata) | ART | Aichi Prefecture |
| Chausuyama Castle (Shinano) | ART | Nagano Prefecture |
| Chiba Castle | Eric | Chiba Prefecture |
| Chifuruya Castle (Sanada) | ART | Nagano Prefecture |
| Chigasaki Castle | Eric | Kanagawa Prefecture |
| Chihaya Castle | Phibbyfan | Osaka |
| Chikaoka Castle | ART | Aichi Prefecture |
| Chikatou Fort | ART | Nagano Prefecture |
| Chikuma Goten'yama Castle | ART | Nagano Prefecture |
| Chikusa Castle | ART | Mie Prefecture |
| Chikuzenbara Fort | ART | Yamanashi Prefecture |
| Chimura Yashiki | ART | Gifu Prefecture |
| Chinaha Castle | RaymondW | Okinawa Prefecture |
| Chinen Castle | RaymondW | Okinawa Prefecture |
| Chiran Castle | Frank T. | Kagoshima Prefecture |
| Chofuku Castle | Eric | Tochigi Prefecture |
| Chouja Yashiki (Totomi) | ART | Shizuoka Prefecture |
| Choujaike Yakata | ART | Nagano Prefecture |
| Choujayama Castle | ART | Ibaraki Prefecture |
| Choujayashiki Yakata | ART | Nagano Prefecture |
| Choukokuji Fort | ART | Yamanashi Prefecture |
| Chousenji Fort | ART | Yamanashi Prefecture |
| Choushouin Yakata | ART | Nagano Prefecture |
| Chouzenjimae Jin'ya | ART | Yamanashi Prefecture |
| Daikan Yashiki | ART | Aichi Prefecture |
| Daikan'yama Fort | ART | Nagano Prefecture |
| Daikan'yashiki Castle | ART | Aichi Prefecture |
| Daikannon Castle | ART | Aichi Prefecture |
| Dainenji Yakata | ART | Nagano Prefecture |
| Daita Castle | ART | Aichi Prefecture |
| Daiun'in Doi | ART | Shizuoka Prefecture |
| Damine Castle | Furinkazan | Aichi Prefecture |
| Damine Yashiki | ART | Aichi Prefecture |
| Dannoura Battery | ART | Yamaguchi Prefecture |
| Deura Castle | ART | Nagano Prefecture |
| Do Castle (Mikawa) | ART | Aichi Prefecture |
| Dodo Fort | ART | Aichi Prefecture |
| Dohiyama Castle (Nagato) | ART | Yamaguchi Prefecture |
| Doi Castle (Mikawa) | ART | Aichi Prefecture |
| Doi Tono Yashiki | ART | Shiga Prefecture |
| Dokanyama | Eric | Tokyo |
| Dokyou Castle | ART | Nagano Prefecture |
| Dota Castle (Mino) | ART | Gifu Prefecture |
| Doudo Castle (Mikawa) | ART | Aichi Prefecture |
| Dousawa Fort | ART | Nagano Prefecture |
| Doushou Hori | ART | Yamanashi Prefecture |
| Ebe Castle (Omi) | ART | Shiga Prefecture |
| Eboshigata Castle | Eric | Osaka |
| Echizen Katsuyama Castle | Furinkazan | Fukui Prefecture |
| Echizen Ohno Castle | RaymondW | Fukui Prefecture |
| Edo Castle | Eric | Tokyo |
| Egawa Fort | ART | Shizuoka Prefecture |
| Eimeiin Fort | ART | Yamanashi Prefecture |
| Ema Yakata | ART | Gifu Prefecture |
| Enryakuji | ART | Shiga Prefecture |
| Enryakuji Amidadou Fort | ART | Shiga Prefecture |
| Enryakuji Higashitani Fort | ART | Shiga Prefecture |
| Enryakuji Joudoin Fort | ART | Shiga Prefecture |
| Enryakuji Kitatani Fort | ART | Shiga Prefecture |
| Enryakuji Monjurou Fort | ART | Shiga Prefecture |
| Enryakuji Nishitani Fort | ART | Shiga Prefecture |
| Enryakuji Shakadou Fort | ART | Shiga Prefecture |
| Fubukikaito Castle (Ina) | ART | Nagano Prefecture |
| Fuchu Castle (Hitachi) | ART | Ibaraki Prefecture |
| Fudoudou Yakata | ART | Aichi Prefecture |
| Fujihashi Castle (Tokyo) | Eric | Tokyo |
| Fujii Castle (Mikawa) | ART | Aichi Prefecture |
| Fujikake Jin'ya | Eric | Kyoto |
| Fujikawa Castle (Mikawa) | ART | Aichi Prefecture |
| Fujimaki Castle | ART | Nagano Prefecture |
| Fujimaki Yashiki | ART | Yamanashi Prefecture |
| Fujimaru Yakata | ART | Shizuoka Prefecture |
| Fujita Castle | ART | Fukushima Prefecture |
| Fukakusa Yakata | ART | Yamanashi Prefecture |
| Fukayama Castle (Suruga) | ART | Shizuoka Prefecture |
| Fukazawa Castle | Eric | Shizuoka Prefecture |
| Fukigabora Castle | ART | Gifu Prefecture |
| Fukouzu Castle | ART | Aichi Prefecture |
| Fukuchiyama Castle | RaymondW | Kyoto |
| Fukui Castle | Eric | Fukui Prefecture |
| Fukui Castle (Shinano) | ART | Nagano Prefecture |
| Fukujima Castle (Takai) | ART | Nagano Prefecture |
| Fukuju Fort (Odani Castle) | ART | Shiga Prefecture |
| Fukuoka Castle | Kyushudan | Fukuoka Prefecture |
| Fukuouji Yakata | ART | Nagano Prefecture |
| Fukurouga Castle | ART | Aichi Prefecture |
| Fukushima Castle | ART | Fukushima Prefecture |
| Fukushima Castle (Echigo) | ART | Niigata Prefecture |
| Fukushima Castle (Kiso) | ART | Nagano Prefecture |
| Fukutake Castle (Chikuzen) | ART | Fukuoka Prefecture |
| Fukuyama Castle | Eric | Hiroshima Prefecture |
| Fukuyo Castle | ART | Nagano Prefecture |
| Fukuzawa Yakata | ART | Nagano Prefecture |
| Fukuzuka Castle (Mino) | 豪谷 | Gifu Prefecture |
| Fumimichi Castle | ART | Nagano Prefecture |
| Funagatayama Castle | ART | Aichi Prefecture |
| Funage Castle | Eric | Hyogo Prefecture |
| Funai Castle | Frank T. | Oita Prefecture |
| Funaki Castle (Omi) | ART | Shiga Prefecture |
| Funaoka Castle | ART | Miyagi Prefecture |
| Funaokayama Castle | ART | Kyoto |
| Funayama Castle | Eric | Hiroshima Prefecture |
| Funayama Castle (Mikawa) | ART | Aichi Prefecture |
| Funehiki Castle | ART | Fukushima Prefecture |
| Furuhata Yakata | ART | Nagano Prefecture |
| Furui Castle (Mikawa) | ART | Aichi Prefecture |
| Furujiro Fort | ART | Yamanashi Prefecture |
| Furujou Yakata | ART | Nagano Prefecture |
| Furujouyama Castle (Hanishina) | ART | Nagano Prefecture |
| Furukawa Castle | 豪谷 | Gifu Prefecture |
| Furumaya Castle (Azumi) | ART | Nagano Prefecture |
| Furumaya Yakata | ART | Nagano Prefecture |
| Furumiya Castle | ART | Aichi Prefecture |
| Furumiya Castle (Kai) | ART | Yamanashi Prefecture |
| Furusutobaru Ruins | RaymondW | Okinawa Prefecture |
| Furuwatari Castle | ART | Aichi Prefecture |
| Fuse Castle (Sarashina) | ART | Nagano Prefecture |
| Fuseya Castle | ART | Gifu Prefecture |
| Fuseyachouja Yakata | ART | Nagano Prefecture |
| Fushimi Castle | Eric | Kyoto |
| Fusou Castle (Mikawa) | ART | Aichi Prefecture |
| Fusumada Castle | ART | Kanagawa Prefecture |
| Futae Castle (Azumi) | ART | Nagano Prefecture |
| Futamata Castle | Eric | Shizuoka Prefecture |
| Futatsu Bungonokami Yakata | ART | Nagano Prefecture |
| Futatsugi Castle (Azumi) | ART | Nagano Prefecture |
| Futoge Castle | Furinkazan | Ishikawa Prefecture |
| Futoh'yama Castle | ART | Shiga Prefecture |
| Futsukamachi Castle | ART | Gifu Prefecture |
| Futta Castle (Suwa) | ART | Nagano Prefecture |
| Fuwa no Seki | ART | Gifu Prefecture |
| Gakiyama Noroshidai | ART | Nagano Prefecture |
| Gakuden Castle (Owari) | ART | Aichi Prefecture |
| Ganjaku Castle | Furinkazan | Fukuoka Prefecture |
| Ganryakuji Castle | ART | Aichi Prefecture |
| Ganshouin Yakata | ART | Nagano Prefecture |
| Garyuzan Castle | ART | Gifu Prefecture |
| Gassan Toda Castle | Eric | Shimane Prefecture |
| Genbao Castle | Eric | Fukui Prefecture |
| Genga Yashiki (Kai) | ART | Yamanashi Prefecture |
| Genji Yakata (Kai) | ART | Yamanashi Prefecture |
| Gentairi Castle | ART | Nagano Prefecture |
| Gifu Castle | Eric | Gifu Prefecture |
| Gion Castle | Eric | Tochigi Prefecture |
| Gobara Castle | Eric | Gunma Prefecture |
| Gochaku Castle | Eric | Hyogo Prefecture |
| Goi Castle (Mikawa) | ART | Aichi Prefecture |
| Gokan Castle | Eric | Gunma Prefecture |
| Goma Nakamura Castle | Eric | Kyoto |
| Gongen Yakata | ART | Nagano Prefecture |
| Gongen'yama Castle (Mino) | ART | Gifu Prefecture |
| Goryokaku Fort | Eric | Hokkaido |
| Goryoudaira Fort | ART | Yamanashi Prefecture |
| Goryu Castle | Eric | Hiroshima Prefecture |
| Gouda Fort | ART | Toyama Prefecture |
| Goudo Castle | ART | Gifu Prefecture |
| Goudo Noroshidai | ART | Yamanashi Prefecture |
| Gujo Hachiman Castle | Eric | Gifu Prefecture |
| Gushikawa Castle (Itoman Okinawa) | RaymondW | Okinawa Prefecture |
| Gushikawa Castle (Kumejima Okinawa) | RaymondW | Okinawa Prefecture |
| Ha Castle | ART | Aichi Prefecture |
| Haba Castle | ART | Nagano Prefecture |
| Habako Castle | ART | Nagano Prefecture |
| Habauehori Yashiki | ART | Nagano Prefecture |
| Habu Castle | Eric | Kyoto |
| Hachigata Castle | Eric | Saitama Prefecture |
| Hachikenchōja Castle | ART | Nagano Prefecture |
| Hachiman'yama Castle (Tanba) | ART | Hyogo Prefecture |
| Hachimanpara Jinsho | ART | Nagano Prefecture |
| Hachimanshita Battery (Obama Domain) | ART | Fukui Prefecture |
| Hachinohe Castle | Eric | Aomori Prefecture |
| Hachioji Castle | Eric | Tokyo |
| Hadanashi Castle | ART | Aichi Prefecture |
| Hadanashiyama Castle | ART | Aichi Prefecture |
| Haga Castle | Frank T. | Hyogo Prefecture |
| Hagi Castle | Eric | Yamaguchi Prefecture |
| Hagikura Fort | ART | Nagano Prefecture |
| Hagiwarasuwa Castle | 豪谷 | Gifu Prefecture |
| Haguro Castle (Owari) | ART | Aichi Prefecture |
| Haibara Castle | Eric | Nagano Prefecture |
| Haiyama Castle | Eric | Kyoto |
| Hajikamigou Castle | ART | Aichi Prefecture |
| Hajoudo Castle | ART | Aichi Prefecture |
| Hajoudoko Castle | ART | Aichi Prefecture |
| Hakii Castle | ART | Yamanashi Prefecture |
| Hakii Yakata | ART | Yamanashi Prefecture |
| Hakota Castle (Kozuke) | ART | Gunma Prefecture |
| Hakoyama Castle (Takai) | ART | Nagano Prefecture |
| Hakoyanagi Castle | ART | Aichi Prefecture |
| Hakusan Castle | Eric | Yamanashi Prefecture |
| Hakusan Castle (Harima) | ART | Hyogo Prefecture |
| Hamada Castle | Eric | Shimane Prefecture |
| Hamada Castle (Ise) | ART | Mie Prefecture |
| Hamagawa Castle | ART | Gunma Prefecture |
| Hamamatsu Castle | Eric | Shizuoka Prefecture |
| Hanagoya Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Hanakuma Castle | ART | Hyogo Prefecture |
| Hanamaki Castle | ART | Iwate Prefecture |
| Hanaoka Castle (Azumi) | ART | Nagano Prefecture |
| Hanaoka Castle (Saku) | ART | Nagano Prefecture |
| Hanaoka Castle (Suwa) | ART | Nagano Prefecture |
| Hanasaki Castle (Tsuru) | ART | Yamanashi Prefecture |
| Hanawa Castle | Eric | Chiba Prefecture |
| Hanazawa Yakata | ART | Nagano Prefecture |
| Hanazono Castle | Eric | Saitama Prefecture |
| Hanazono Mitake Castle | Eric | Saitama Prefecture |
| Hanehigashi Castle | ART | Aichi Prefecture |
| Hanenishi Castle | ART | Aichi Prefecture |
| Haneo Castle | ART | Gunma Prefecture |
| Hannyaji Castle | Eric | Hyogo Prefecture |
| Harano Castle (Suwa) | ART | Nagano Prefecture |
| Haranomoto Castle | ART | Nagano Prefecture |
| Haruyamako Castle | ART | Nagano Prefecture |
| Haruyamaoh Castle | ART | Nagano Prefecture |
| Hasedo Castle | Eric | Yamagata Prefecture |
| Hashira Castle (Mikawa) | ART | Aichi Prefecture |
| Hatada Castle (Omi) | ART | Shiga Prefecture |
| Hatakenaka Yakata | ART | Nagano Prefecture |
| Hatayama Castle | ART | Nagano Prefecture |
| Hatchou Castle (Mikawa) | ART | Aichi Prefecture |
| Hatsuzawa Castle | ART | Tokyo |
| Hatta Yashiki | ART | Yamanashi Prefecture |
| Hattori Castle (Koka) | Eric | Shiga Prefecture |
| Hayakawa Yashiki (Kai) | ART | Yamanashi Prefecture |
| Hayaotoshi Castle | ART | Nagano Prefecture |
| Hayashi Kohee Yashiki | ART | Yamanashi Prefecture |
| Hayashikojo Castle | Eric | Nagano Prefecture |
| Hayashiohjo Castle | Eric | Nagano Prefecture |
| Hayashizore Castle | ART | Aichi Prefecture |
| Hazu Castle (Ise) | ART | Mie Prefecture |
| Hazu Jin'ya | ART | Aichi Prefecture |
| Hekirichi Jinya | RonS | Hokkaido |
| Hekitani Castle | Eric | Kyoto |
| Henmi Yashiki (Kai) | ART | Yamanashi Prefecture |
| Hida Castle (Omi) | 豪谷 | Shiga Prefecture |
| Hieinoyama Fort | ART | Nagano Prefecture |
| Higashi Goma Castle | Eric | Kyoto |
| Higashi Kuramae Castle | ART | Aichi Prefecture |
| Higashi Maruoka Castle (Koka) | Eric | Shiga Prefecture |
| Higashi Sakabe Castle | ART | Mie Prefecture |
| Higashi Wada Castle | ART | Nagano Prefecture |
| Higashijou Castle (Chikuma) | ART | Nagano Prefecture |
| Higuchi Castle (Omi) | ART | Shiga Prefecture |
| Higuchiuchi Castle (Ina) | ART | Nagano Prefecture |
| Hijika Castle | ART | Aichi Prefecture |
| Hijiyama Castle (Iga) | 豪谷 | Mie Prefecture |
| Hikaru Castle | ART | Nagano Prefecture |
| Hiki Castle | ART | Nagano Prefecture |
| Hikida Castle | ART | Fukui Prefecture |
| Hikidono Yashiki | ART | Nagano Prefecture |
| Hikobe Yashiki | Eric | Gunma Prefecture |
| Hikone Castle | Eric | Shiga Prefecture |
| Hikuma Castle | Eric | Shizuoka Prefecture |
| Hime Castle (Chikuma) | ART | Nagano Prefecture |
| Hime Castle (Hanishina) | ART | Nagano Prefecture |
| Hime Castle (Mikawa) | ART | Aichi Prefecture |
| Himega Castle (Mikawa) | 豪谷 | Aichi Prefecture |
| Himeji Castle | Eric | Hyogo Prefecture |
| Himuro Yakata | ART | Nagano Prefecture |
| Hina Yashiki | ART | Aichi Prefecture |
| Hinatabata Yakata | ART | Nagano Prefecture |
| Hino Castle | Furinkazan | Shiga Prefecture |
| Hinode Castle | ART | Yamanashi Prefecture |
| Hinohara Castle | ART | Tokyo |
| Hirabayashi Castle (Minochi) | ART | Nagano Prefecture |
| Hirado Castle | Frank T. | Nagasaki Prefecture |
| Hirai Castle | Eric | Gunma Prefecture |
| Hirai Castle (Omi) | ART | Shiga Prefecture |
| Hirai Kanayama Castle | Eric | Gunma Prefecture |
| Hirai Yashiki (Kai) | ART | Yamanashi Prefecture |
| Hiraide Moated Settlement | ART | Nagano Prefecture |
| Hiraiwa Castle (Mikawa) | ART | Aichi Prefecture |
| Hiraizumi Date | Furinkazan | Iwate Prefecture |
| Hirakura Castle | ART | Nagano Prefecture |
| Hirao Castle (Ise) | ART | Mie Prefecture |
| Hirase Castle | ART | Nagano Prefecture |
| Hirase Kitano Castle | ART | Nagano Prefecture |
| Hirase Noroshidai | ART | Yamanashi Prefecture |
| Hirase Yakata | ART | Nagano Prefecture |
| Hirata Yashiki | ART | Yamanashi Prefecture |
| Hiratsuka Castle | Eric | Tokyo |
| Hirosaki Castle | Eric | Aomori Prefecture |
| Hirose Castle (Hida) | 豪谷 | Gifu Prefecture |
| Hiroshima Castle | Eric | Hiroshima Prefecture |
| Hirota Castle | ART | Nagano Prefecture |
| Hisawa Castle | ART | Nagano Prefecture |
| Hishakuyama Castle | Eric | Gunma Prefecture |
| Hitomoshi Castle (Saku) | ART | Nagano Prefecture |
| Hitomoshiyama Fort (Suwa) | ART | Nagano Prefecture |
| Hitoyoshi Castle | Frank T. | Kumamoto Prefecture |
| Hiyama Castle | Eric | Akita Prefecture |
| Hizen Nagoya Castle | Kyushudan | Saga Prefecture |
| Hobonishi Castle | ART | Mie Prefecture |
| Hodarakuji Castle | ART | Shiga Prefecture |
| Hojo Clan Residence | ART | Shizuoka Prefecture |
| Hokkyu Castle | ART | Aichi Prefecture |
| Hokkyu Jin'ya | ART | Aichi Prefecture |
| Hongou Castle (Owari) | ART | Aichi Prefecture |
| Honjin'yama Castle (Mino) | ART | Gifu Prefecture |
| Honjinzawabata Fort | ART | Nagano Prefecture |
| Honshouji Castle | ART | Aichi Prefecture |
| Hora Castle (Mikawa) | ART | Aichi Prefecture |
| Hora Yakata | ART | Nagano Prefecture |
| Hori Castle (Minochi) | ART | Nagano Prefecture |
| Horigane Yakata | ART | Nagano Prefecture |
| Horigoe Palace | ART | Shizuoka Prefecture |
| Horikawa Castle | ART | Shizuoka Prefecture |
| Horikoshi Castle | Eric | Aomori Prefecture |
| Horinouchi Castle (Kai) | ART | Yamanashi Prefecture |
| Horinouchi Yakata (Azumi) | ART | Nagano Prefecture |
| Horinouchi Yakata (Ina) | ART | Nagano Prefecture |
| Horinouchi Yashiki | ART | Nagano Prefecture |
| Horishi Yakata (Omi) | ART | Shiga Prefecture |
| Horiuchi Castle (Mikawa) | ART | Aichi Prefecture |
| Horiuchi Shingu Castle | ART | Wakayama Prefecture |
| Hoshigasaki Castle | Eric | Shiga Prefecture |
| Hoshina Maenoyama Fort | ART | Nagano Prefecture |
| Hoshina Yakata | ART | Nagano Prefecture |
| Hoshiyamako Castle | ART | Yamanashi Prefecture |
| Hosogaya Yakata | ART | Nagano Prefecture |
| Hosokawagonsui Castle | ART | Aichi Prefecture |
| Hosokawaonmaeda Castle | ART | Aichi Prefecture |
| Hosokawashiroyama Castle | ART | Aichi Prefecture |
| Hosshouji Castle (Mikawa) | ART | Aichi Prefecture |
| Hotaka Yakata | ART | Nagano Prefecture |
| Hotta no Saku | Frank T. | Akita Prefecture |
| Houjiin Doi | ART | Shizuoka Prefecture |
| Hourinji Yakata | ART | Tokyo |
| Houshouji Fort | ART | Nagano Prefecture |
| Houzouji Yakata | ART | Nagano Prefecture |
| Hyakusaiji Castle | ART | Shiga Prefecture |
| Hyogo Castle | Andrew A | Hyogo Prefecture |
| Iba Castle | ART | Shiga Prefecture |
| Iba Palace | ART | Shiga Prefecture |
| Ibako Castle | ART | Shiga Prefecture |
| Ibaraki Castle | Eric | Osaka |
| Ibarayama Castle | ART | Nagano Prefecture |
| Ibayama Castle | ART | Shiga Prefecture |
| Ibi Castle | ART | Gifu Prefecture |
| Ibuka Castle | ART | Nagano Prefecture |
| Ichiba Castle (Ise) | ART | Mie Prefecture |
| Ichibajin'yama Castle (Koka) | ART | Shiga Prefecture |
| Ichigousan Castle | ART | Gunma Prefecture |
| Ichijodani Castle | Eric | Fukui Prefecture |
| Ichijodani Kojo Castle | Eric | Fukui Prefecture |
| Ichijodaniyama Castle | Eric | Fukui Prefecture |
| Ichijojiyama Castle | Eric | Kyoto |
| Ichikawa Jin'ya | ART | Yamanashi Prefecture |
| Ichinodaira Castle (Ina) | ART | Nagano Prefecture |
| Ichinomiya Castle | RaymondW | Tokushima Prefecture |
| Ida Castle (Mikawa) | ART | Aichi Prefecture |
| Ide Yakata | ART | Shizuoka Prefecture |
| Iden Castle | Eric | Kyoto |
| Iden Miyanokoshi Castle | Eric | Kyoto |
| Iga Castle (Mikawa) | ART | Aichi Prefecture |
| Iga Ueno Castle | Frank T. | Mie Prefecture |
| Igawa Castle | ART | Nagano Prefecture |
| Ii Yakata | ART | Shizuoka Prefecture |
| Iida Castle | ART | Nagano Prefecture |
| Iida Castle (Azumi) | ART | Nagano Prefecture |
| Iida Castle (Totomi) | ART | Shizuoka Prefecture |
| Iida Fort | ART | Nagano Prefecture |
| Iida Yashiki | ART | Yamanashi Prefecture |
| Iidako Castle (Totomi) | ART | Shizuoka Prefecture |
| Iijima Jin'ya | ART | Nagano Prefecture |
| Iimori Castle | Eric | Osaka |
| Iimori Castle (Azumi) | ART | Nagano Prefecture |
| Iimoriyama Castle (Asuke) | ART | Aichi Prefecture |
| Iinawa Castle | ART | Nagano Prefecture |
| Iino Taira Castle | ART | Fukushima Prefecture |
| Iinoya Castle | ART | Shizuoka Prefecture |
| Iinuma Castle | ART | Ibaraki Prefecture |
| Iiyama Castle | ART | Nagano Prefecture |
| Iizuna Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Iji Castle | ART | Miyagi Prefecture |
| Ijiri Yashiki | ART | Yamanashi Prefecture |
| Ikarashi Yakata | ART | Niigata Prefecture |
| Ikeda Castle | Eric | Osaka |
| Ikeda Castle (Mino) | ART | Gifu Prefecture |
| Ikeda Yakata (Omi) | ART | Shiga Prefecture |
| Ikenoshiri Yakata | ART | Shiga Prefecture |
| Ikkui Yashiki (Kai) | ART | Yamanashi Prefecture |
| Ima Castle (Mino) | ART | Gifu Prefecture |
| Imabari Castle | Eric | Ehime Prefecture |
| Imai Castle | Eric | Tokyo |
| Imai Fort | ART | Nagano Prefecture |
| Imai Jin'ya | ART | Nagano Prefecture |
| Imai Yashiki (Kai) | ART | Yamanashi Prefecture |
| Imamura Castle (Omi) | ART | Shiga Prefecture |
| Imamura Castle (Yamashiro) | ART | Kyoto |
| Imasu Castle (Mino) | ART | Gifu Prefecture |
| Imori Castle (Suwa) | ART | Nagano Prefecture |
| Imoto Castle (Omi) | ART | Shiga Prefecture |
| Ina Castle | ART | Aichi Prefecture |
| Ina Yashiki | Eric | Saitama Prefecture |
| Inamura Castle (Ina) | ART | Nagano Prefecture |
| Inamurafuru Castle | ART | Nagano Prefecture |
| Inaniwa Castle | ART | Akita Prefecture |
| Inariyama Castle (Saku) | ART | Nagano Prefecture |
| Inariyama Castle (Sarashina) | ART | Nagano Prefecture |
| Inatsuke Castle | Eric | Tokyo |
| Inawashiro Castle | Eric | Fukushima Prefecture |
| Injiki Castle | ART | Gifu Prefecture |
| Innoshima Suigun Castle | Furinkazan | Hiroshima Prefecture |
| Inoko Yakata | ART | Shiga Prefecture |
| Inokuchi Castle | ART | Aichi Prefecture |
| Inokuchi Castle (Nukata) | ART | Aichi Prefecture |
| Inokura Castle | Eric | Kyoto |
| Inoue Castle | ART | Nagano Prefecture |
| Inoue Yakata | ART | Nagano Prefecture |
| Inoue Yakata (Shiga) | Eric | Shiga Prefecture |
| Inuinofuru Castle | ART | Nagano Prefecture |
| Inukai Castle | Eric | Nagano Prefecture |
| Inukai Yakata | ART | Nagano Prefecture |
| Inuyama Castle | Eric | Aichi Prefecture |
| Ioto Castle | ART | Nagano Prefecture |
| Iouji Fort | ART | Aichi Prefecture |
| Ioyama Castle | Phibbyfan | Okayama Prefecture |
| Iroganeyama Fort | ART | Aichi Prefecture |
| Isawa Castle | ART | Iwate Prefecture |
| Isawa Jin'ya | ART | Yamanashi Prefecture |
| Isezaki Castle (Sanada) | ART | Nagano Prefecture |
| Ishibashi Castle | ART | Aichi Prefecture |
| Ishibayama Castle (Omi) | ART | Shiga Prefecture |
| Ishida Castle (Mikawa) | ART | Aichi Prefecture |
| Ishida Jin'ya | ART | Aichi Prefecture |
| Ishigakiyama Ichiya Castle | Eric | Kanagawa Prefecture |
| Ishigami Castle | ART | Ibaraki Prefecture |
| Ishihama Castle | ART | Tokyo |
| Ishikawa Jouzan Yashiki | ART | Aichi Prefecture |
| Ishimakiyama Castle | ART | Aichi Prefecture |
| Ishimura Castle | ART | Nagano Prefecture |
| Ishinomaki Castle | AnneMcL | Miyagi Prefecture |
| Ishitono Yashiki | ART | Nagano Prefecture |
| Ishiwata Yakata | ART | Nagano Prefecture |
| Isobe Castle | Eric | Gunma Prefecture |
| Isobe Castle (Mikawa) | ART | Aichi Prefecture |
| Isshiki Castle (Chita) | ART | Aichi Prefecture |
| Isshiki Castle (Omi) | ART | Shiga Prefecture |
| Isshiki Castle (Suruga) | ART | Shizuoka Prefecture |
| Isshindenjinai Moated Settlement | ART | Mie Prefecture |
| Itabashi Castle | Eric | Tokyo |
| Itadafuru Yashiki (Mikawa) | ART | Aichi Prefecture |
| Itagaki Kanenobu Yashiki | ART | Yamanashi Prefecture |
| Itagakiyama Noroshidai | ART | Yamanashi Prefecture |
| Itami Castle | Eric | Hyogo Prefecture |
| Itazuke Moated Settlement | ART | Fukuoka Prefecture |
| Itoi Jin'ya | ART | Hyogo Prefecture |
| Itoigawa Jinya | ART | Niigata Prefecture |
| Itokazu Castle | RaymondW | Okinawa Prefecture |
| Itou Genba Yashiki | ART | Yamanashi Prefecture |
| Itousakaue Fort | ART | Nagano Prefecture |
| Iuchi Castle (Mikawa) | ART | Aichi Prefecture |
| Iwabitsu Castle | Eric | Gunma Prefecture |
| Iwabuchi Castle (Aida) | ART | Nagano Prefecture |
| Iwade Danjou Kyokan | ART | Gifu Prefecture |
| Iwade Yashiki (Kai) | ART | Yamanashi Prefecture |
| Iwadono Castle | Eric | Yamanashi Prefecture |
| Iwahara Castle (Azumi) | ART | Nagano Prefecture |
| Iwahori Castle (Mikawa) | ART | Aichi Prefecture |
| Iwaki Taira Castle | ART | Fukushima Prefecture |
| Iwakiri Castle | Eric | Miyagi Prefecture |
| Iwakubo Yakata | ART | Yamanashi Prefecture |
| Iwakuni Castle | Eric | Yamaguchi Prefecture |
| Iwakura Castle | ART | Shiga Prefecture |
| Iwakura Castle (Mikawa) | ART | Aichi Prefecture |
| Iwakura Castle (Owari) | ART | Aichi Prefecture |
| Iwakura Yakata (Mikawa) | ART | Aichi Prefecture |
| Iwakuratouge Castle (Mikawa) | ART | Aichi Prefecture |
| Iwamura Castle | RaymondW | Gifu Prefecture |
| Iwaoka Yakata | ART | Nagano Prefecture |
| Iwasaki Castle | ART | Aichi Prefecture |
| Iwasaki Castle (Hanishina) | ART | Nagano Prefecture |
| Iwasaki Castle (Mutsu) | ART | Iwate Prefecture |
| Iwasaki Yakata | ART | Yamanashi Prefecture |
| Iwasakiyama Fort | Eric | Shiga Prefecture |
| Iwaseyama Castle | ART | Fukushima Prefecture |
| Iwato Castle (Mikawa) | ART | Aichi Prefecture |
| Iwatsuki Castle | Eric | Saitama Prefecture |
| Iwaya Castle | ART | Fukuoka Prefecture |
| Iwazu Castle | ART | Aichi Prefecture |
| Iwazu Daizen Castle | ART | Aichi Prefecture |
| Iwazu Daizennishi Castle | ART | Aichi Prefecture |
| Iwazu Dannoue Castle | ART | Aichi Prefecture |
| Iwazu Ino Castle | ART | Aichi Prefecture |
| Iwazu Kibira Castle | ART | Aichi Prefecture |
| Iwazu Myoshinji Castle | ART | Aichi Prefecture |
| Iwazu Naruse Castle | ART | Aichi Prefecture |
| Iwazushin Castle | ART | Aichi Prefecture |
| Iyo Matsuyama Castle | Eric | Ehime Prefecture |
| Izaki Castle | Eric | Kyoto |
| Izu Nagahama Castle | Eric | Shizuoka Prefecture |
| Izuki Jin'ya | ART | Nagano Prefecture |
| Izumi Jin'ya | ART | Fukushima Prefecture |
| Izumigashira Castle | ART | Shizuoka Prefecture |
| Izushi Castle | Eric | Hyogo Prefecture |
| Jikki Yashiki | ART | Yamanashi Prefecture |
| Jikouin Fort | ART | Nagano Prefecture |
| Jikouin Yakata | ART | Nagano Prefecture |
| Jinbagahara Castle | ART | Nagano Prefecture |
| Jindaiji Castle | Eric | Tokyo |
| Jinguuji Yakata | ART | Nagano Prefecture |
| Jinnoya Castle (Mikawa) | ART | Aichi Prefecture |
| Jionji Yakata | ART | Shiga Prefecture |
| Jissouji Yakata | ART | Yamanashi Prefecture |
| Jizen Castle (Koka) | Eric | Shiga Prefecture |
| Jofukuji Castle | Eric | Tokyo |
| Jou Ian Yashiki | ART | Yamanashi Prefecture |
| Jouguuji Castle | ART | Aichi Prefecture |
| Jouhikage Fort | ART | Nagano Prefecture |
| Joujou Castle | ART | Aichi Prefecture |
| Joukouin Yakata | ART | Nagano Prefecture |
| Joumineyama Castle | ART | Nagano Prefecture |
| Joumura Castle (Ina) | ART | Nagano Prefecture |
| Joumurafuru Castle | ART | Nagano Prefecture |
| Jounoue Fort | ART | Nagano Prefecture |
| Jukkumi Yashiki | ART | Yamanashi Prefecture |
| Junhanshi Yashiki | ART | Fukui Prefecture |
| Jurakudai | ART | Kyoto |
| Juuouzan Fort | ART | Gunma Prefecture |
| Kabuto Castle | ART | Mie Prefecture |
| Kadone Castle (Omi) | ART | Shiga Prefecture |
| Kaesa Castle | ART | Nagano Prefecture |
| Kagami Yakata | ART | Yamanashi Prefecture |
| Kagamiyama Fort | ART | Aichi Prefecture |
| Kaganoi Castle | ART | Gifu Prefecture |
| Kageyama Castle (Mikawa) | ART | Aichi Prefecture |
| Kagikakemonomi Fort | ART | Nagano Prefecture |
| Kagohana Fort | ART | Shizuoka Prefecture |
| Kagoshima Castle | | Kagoshima Prefecture |
| Kaguraoka Castle | Eric | Kyoto |
| Kaibai Castle | ART | Nagano Prefecture |
| Kaibara Jinya | Andrew A | Hyogo Prefecture |
| Kaiden Castle | Eric | Kyoto |
| Kaize Castle (Saku) | ART | Nagano Prefecture |
| Kajiya Castle | ART | Aichi Prefecture |
| Kake Castle (Hazu) | ART | Aichi Prefecture |
| Kake Castle (Nukata) | ART | Aichi Prefecture |
| Kakegawa Castle | Eric | Shizuoka Prefecture |
| Kakegawako Castle | ART | Shizuoka Prefecture |
| Kakiage Castle (Chikuma) | ART | Nagano Prefecture |
| Kakimi Castle (Omi) | ART | Shiga Prefecture |
| Kakinohana Castle | RaymondW | Okinawa Prefecture |
| Kakizaki Castle | ART | Niigata Prefecture |
| Kakuhari Yashiki | ART | Nagano Prefecture |
| Kakunodate Castle | Eric | Akita Prefecture |
| Kakutsugawa Castle | ART | Aichi Prefecture |
| Kamaenohaka Yakata | ART | Nagano Prefecture |
| Kamagari Castle (Omi) | ART | Shiga Prefecture |
| Kamagatake Castle | ART | Nagano Prefecture |
| Kamaha Castle | Eric | Shiga Prefecture |
| Kamaian Yakata | ART | Nagano Prefecture |
| Kamakata Jin'ya | ART | Aichi Prefecture |
| Kameda Castle | ART | Akita Prefecture |
| Kamegasaki Castle | ART | Yamagata Prefecture |
| Kamei Castle | Eric | Hiroshima Prefecture |
| Kamei Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Kameyama Battery | ART | Yamaguchi Prefecture |
| Kameyama Castle | ART | Mie Prefecture |
| Kameyama Castle (Azumi) | ART | Nagano Prefecture |
| Kameyama Castle (Kii) | Eric | Wakayama Prefecture |
| Kameyama Castle (Mikawa) | ART | Aichi Prefecture |
| Kami Castle (Suwa) | ART | Nagano Prefecture |
| Kamigare Castle | ART | Gifu Prefecture |
| Kamigatou Yashiki | ART | Yamanashi Prefecture |
| Kamigishimoto Castle (Omi) | ART | Shiga Prefecture |
| Kamihiraideko Castle (Ina) | ART | Nagano Prefecture |
| Kamiiida Jin'ya | ART | Yamanashi Prefecture |
| Kamijima Castle (Ina) | ART | Nagano Prefecture |
| Kamikurabara Fort | ART | Yamanashi Prefecture |
| Kamimakifuru Castle | ART | Nagano Prefecture |
| Kaminagahara Castle | ART | Shiga Prefecture |
| Kaminogou Castle | ART | Aichi Prefecture |
| Kaminoyama Castle | Eric | Yamagata Prefecture |
| Kamioka Castle | ART | Gifu Prefecture |
| Kamitohno Castle | ART | Fukushima Prefecture |
| Kamiwada Castle | ART | Aichi Prefecture |
| Kamo Castle (Bitchu) | ART | Okayama Prefecture |
| Kamogatake Castle | ART | Nagano Prefecture |
| Kamomegasaki Battery (Obama Domain) | ART | Fukui Prefecture |
| Kan'onsaka Castle (Hanishina) | ART | Nagano Prefecture |
| Kanaiyama Castle | Eric | Nagano Prefecture |
| Kanao Yogaisan Castle | Eric | Saitama Prefecture |
| Kanasashi Yakata | ART | Nagano Prefecture |
| Kanayama Castle | Eric | Gunma Prefecture |
| Kanayama Castle (Echigo) | ART | Niigata Prefecture |
| Kanazawa Castle | Eric | Ishikawa Prefecture |
| Kanbara Castle | ART | Gunma Prefecture |
| Kanbayashi Castle | Eric | Kyoto |
| Kanbe Castle | ART | Mie Prefecture |
| Kanegasaki Battery (Obama Domain) | ART | Fukui Prefecture |
| Kanegasaki Castle | ART | Fukui Prefecture |
| Kanegasaki Castle (Iwate) | Eric | Iwate Prefecture |
| Kaneko Castle (Suwa) | ART | Nagano Prefecture |
| Kaneko Yashiki (Minochi) | ART | Nagano Prefecture |
| Kanemaru Yakata | ART | Yamanashi Prefecture |
| Kaneyama Castle (Mino) | ART | Gifu Prefecture |
| Kaneyama Castle (Mutsu) | ART | Miyagi Prefecture |
| Kanmuriyama Castle (Bitchu) | ART | Okayama Prefecture |
| Kannonji Castle | Eric | Shiga Prefecture |
| Kannosan Castle | Eric | Kyoto |
| Kano Castle | Eric | Gifu Prefecture |
| Kanzeyamachi Battery (Obama Domain) | ART | Fukui Prefecture |
| Kanzou Yashiki | ART | Yamanashi Prefecture |
| Karakai Castle | Eric | Tokyo |
| Karasaki Castle | ART | Nagano Prefecture |
| Karasawayama Castle | Eric | Tochigi Prefecture |
| Karasuyama Castle | Eric | Tochigi Prefecture |
| Karatoriya Castle | ART | Nagano Prefecture |
| Karatsu Castle | | Saga Prefecture |
| Karidako Castle | ART | Nagano Prefecture |
| Karidaoh Castle | ART | Nagano Prefecture |
| Kariya Castle | ART | Aichi Prefecture |
| Kariyahara Castle | ART | Nagano Prefecture |
| Kasama Castle | Eric | Ibaraki Prefecture |
| Kasane Castle | ART | Nagano Prefecture |
| Kasashima Castle | | Kagawa Prefecture |
| Kaseyama Castle | RaymondW | Kyoto |
| Kashima Castle (Hizen) | ART | Saga Prefecture |
| Kashiwabara Castle (Omi) | ART | Shiga Prefecture |
| Kashiwabara Palace | ART | Shiga Prefecture |
| Kashiwara Castle | ART | Mie Prefecture |
| Kashiwayama Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Kasuga Castle (Ina) | ART | Nagano Prefecture |
| Kasugayama Castle | Eric | Niigata Prefecture |
| Kasumi Castle | Eric | Nagano Prefecture |
| Kasumiga Castle (Suwa) | ART | Nagano Prefecture |
| Katahara Castle (Mikawa) | ART | Aichi Prefecture |
| Katakari Castle (Tanba) | ART | Hyogo Prefecture |
| Katakura Castle | Eric | Tokyo |
| Katsumata Castle | ART | Shizuoka Prefecture |
| Katsumoto Castle | Chottomat | Nagasaki Prefecture |
| Katsunuma Castle | Eric | Tokyo |
| Katsunumashi Yakata | Eric | Yamanashi Prefecture |
| Katsurao Castle (Hanishina) | ART | Nagano Prefecture |
| Katsurayama Castle | ART | Nagano Prefecture |
| Katsuren Castle | TerryP | Okinawa Prefecture |
| Katsushima Castle (Omi) | ART | Shiga Prefecture |
| Katsuyama Castle (Echigo) | ART | Niigata Prefecture |
| Katsuyama Castle (Nagato) | ART | Yamaguchi Prefecture |
| Katsuyama Castle (Tsuru) | Eric | Yamanashi Prefecture |
| Katsuyama Castle (Yatsushiro) | ART | Yamanashi Prefecture |
| Katsuyama Palace | ART | Yamaguchi Prefecture |
| Kattori Castle (Chikuma) | ART | Nagano Prefecture |
| Kawagoe Castle | Eric | Saitama Prefecture |
| Kawahara Castle | ART | Tottori Prefecture |
| Kawajiri Castle | ART | Aichi Prefecture |
| Kawamura Castle | Eric | Kanagawa Prefecture |
| Kawamura Yakata | ART | Kanagawa Prefecture |
| Kawanami Castle (Omi) | ART | Shiga Prefecture |
| Kawanoe Castle | Frank T. | Ehime Prefecture |
| Kawasaki Battery (Obama Domain) | ART | Fukui Prefecture |
| Kawasaki Shoujirou Yakata | ART | Tokyo |
| Kawasaki no Saku | ART | Iwate Prefecture |
| Kawashima Castle | RaymondW | Tokushima Prefecture |
| Kawashimamurako Castle | ART | Aichi Prefecture |
| Kawawada Castle | ART | Ibaraki Prefecture |
| Kaya Yakata | ART | Okayama Prefecture |
| Kazama Yakata | ART | Nagano Prefecture |
| Kazama Yashiki (Kai) | ART | Yamanashi Prefecture |
| Kazue Yashiki (Nukata) | ART | Aichi Prefecture |
| Kazurayama Castle | Eric | Shizuoka Prefecture |
| Kazurayama Yakata | Eric | Shizuoka Prefecture |
| Keirozan Castle | Eric | Hyogo Prefecture |
| Kemi Castle (Chiisagata) | ART | Nagano Prefecture |
| Kemi Castle (Chikuma) | ART | Nagano Prefecture |
| Kemurino Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Ken Castle (Kozuke) | ART | Gunma Prefecture |
| Kesadaira Castle | ART | Aichi Prefecture |
| Kibune Castle | ART | Nagano Prefecture |
| Kibyu Castle | ART | Aichi Prefecture |
| Kido Castle (Mikawa) | ART | Aichi Prefecture |
| Kidoko Castle (Mikawa) | ART | Aichi Prefecture |
| Kiga Jin'ya | ART | Shizuoka Prefecture |
| Kikkawa Motoharu Yakata | ART | Hiroshima Prefecture |
| Kikuchi Castle | Kyushudan | Kumamoto Prefecture |
| Kimura Castle | Eric | Shiga Prefecture |
| Kinebuchi Yakata | ART | Nagano Prefecture |
| Kinojo | Eric | Okayama Prefecture |
| Kinoshita Castle | ART | Aichi Prefecture |
| Kinowa Castle | ART | Yamagata Prefecture |
| Kinzan Castle | Eric | Hyogo Prefecture |
| Kirarazaka Castle | Eric | Kyoto |
| Kiridohshi Jin'ya | ART | Gifu Prefecture |
| Kiridouzan Noroshidai | ART | Nagano Prefecture |
| Kirihara Castle | Eric | Nagano Prefecture |
| Kirihara Castle (Minochi) | ART | Nagano Prefecture |
| Kirihara Yakata | ART | Nagano Prefecture |
| Kiriyama Castle | Andrew A | Mie Prefecture |
| Kisai Castle | ART | Saitama Prefecture |
| Kishiwada Castle | Eric | Osaka |
| Kiso Daikansho | ART | Nagano Prefecture |
| Kiso Yoshinaka Yakata | ART | Nagano Prefecture |
| Kisotono Yashiki | ART | Nagano Prefecture |
| Kissatsu Castle | ART | Yamanashi Prefecture |
| Kita Kumai Castle | ART | Nagano Prefecture |
| Kita Majino Castle | ART | Nagano Prefecture |
| Kita Tsuda Castle | ART | Shiga Prefecture |
| Kita Wakamiko Castle | ART | Yamanashi Prefecture |
| Kitaaranami Fort | ART | Gunma Prefecture |
| Kitabatakeshi Yakata | Andrew A | Mie Prefecture |
| Kitabatakeshi Yakata Tsumenoshiro | Andrew A | Mie Prefecture |
| Kitabodaiji Castle (Omi) | ART | Shiga Prefecture |
| Kitagata Castle (Ibi) | ART | Gifu Prefecture |
| Kitagata Castle (Motosu) | ART | Gifu Prefecture |
| Kitagata Jin'ya | ART | Gifu Prefecture |
| Kitagejou Fort | ART | Yamanashi Prefecture |
| Kitagejou Yashiki | ART | Yamanashi Prefecture |
| Kitamura Castle (Omi) | ART | Shiga Prefecture |
| Kitano Castle (Ina) | ART | Nagano Prefecture |
| Kitanosho Castle | Eric | Fukui Prefecture |
| Kitanosho Castle (Omi) | ART | Shiga Prefecture |
| Kitasudayama Castle (Omi) | ART | Shiga Prefecture |
| Kitatsumeno Fort | ART | Gunma Prefecture |
| Kitsuki Castle | Frank T. | Oita Prefecture |
| Kitsune Castle (Azumi) | ART | Nagano Prefecture |
| Kitsuneyashiki Yakata | ART | Nagano Prefecture |
| Kiyomizu Castle (Ina) | ART | Nagano Prefecture |
| Kiyosaki Castle (Echigo) | ART | Niigata Prefecture |
| Kiyosu Castle | Eric | Aichi Prefecture |
| Kizu Castle | Eric | Kyoto |
| Kobinata Oh'yashiki | ART | Nagano Prefecture |
| Kobushi Castle (Tsuru) | ART | Yamanashi Prefecture |
| Kochi Castle | Eric | Kochi Prefecture |
| Kodera Castle (Mino) | ART | Gifu Prefecture |
| Kofu Castle | Eric | Yamanashi Prefecture |
| Koga Castle | Furinkazan | Ibaraki Prefecture |
| Kogamine Castle (Kyoto) | Eric | Kyoto |
| Kogane Castle | Eric | Chiba Prefecture |
| Kogane Castle (Mikawa) | ART | Aichi Prefecture |
| Kohyama Castle | Eric | Hyogo Prefecture |
| Koibuchi Castle | ART | Ibaraki Prefecture |
| Koide Castle (Ina) | ART | Nagano Prefecture |
| Koide Yakata (Tanba) | Eric | Kyoto |
| Koike Fort | ART | Nagano Prefecture |
| Koiwatake Castle | ART | Nagano Prefecture |
| Kojima Castle (Hida) | ART | Gifu Prefecture |
| Kokokuji Castle | Eric | Shizuoka Prefecture |
| Kokura Castle | ART | Fukuoka Prefecture |
| Kokururi Castle | Eric | Chiba Prefecture |
| Kokuryou Castle (Omi) | ART | Shiga Prefecture |
| Kokuryou Castle (Tanba) | ART | Hyogo Prefecture |
| Kokuzousan Castle (Aida) | ART | Nagano Prefecture |
| Kokuzousan Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Kokuzousan Noroshidai | ART | Nagano Prefecture |
| Kokuzousanminami Fort (Aida) | ART | Nagano Prefecture |
| Kokuzousannanseioneno Castle (Aida) | ART | Nagano Prefecture |
| Kokuzousannishi Fort (Aida) | ART | Nagano Prefecture |
| Komai Yashiki | ART | Yamanashi Prefecture |
| Komaki Castle | Eric | Aichi Prefecture |
| Komaki Castle (Chiisagata) | ART | Nagano Prefecture |
| Komakijou Ohte Fort | ART | Nagano Prefecture |
| Komakikamino Castle (Chiisagata) | ART | Nagano Prefecture |
| Komaruyama Castle (Kiso) | ART | Nagano Prefecture |
| Komaruyama Fort (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Komasawa Castle | ART | Nagano Prefecture |
| Komatsu Castle | ART | Ishikawa Prefecture |
| Komatsu Castle (Sagami) | ART | Kanagawa Prefecture |
| Komatsuyama Noroshidai | ART | Yamanashi Prefecture |
| Komazawa Castle (Minochi) | ART | Nagano Prefecture |
| Komesu Castle | RaymondW | Okinawa Prefecture |
| Komihanachi Castle | Eric | Fukui Prefecture |
| Komiyama Yakata | ART | Nagano Prefecture |
| Komono Castle | 豪谷 | Mie Prefecture |
| Komori Castle (Omi) | ART | Shiga Prefecture |
| Komori Yakata (Sarashina) | ART | Nagano Prefecture |
| Komoro Castle | Eric | Nagano Prefecture |
| Kongouji Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Kongouji Castle (Omi) | ART | Shiga Prefecture |
| Konishi Castle (Ina) | ART | Nagano Prefecture |
| Konodai Castle | Eric | Chiba Prefecture |
| Konosumiyama Castle | Eric | Hyogo Prefecture |
| Koori Nishiyama Castle | Eric | Fukushima Prefecture |
| Koraku Castle | ART | Nagano Prefecture |
| Korin Castle (Ina) | ART | Nagano Prefecture |
| Koriyama Castle (Hiroshima) | Eric | Hiroshima Prefecture |
| Koromo Castle | ART | Aichi Prefecture |
| Koromogawa Date | ART | Iwate Prefecture |
| Kosakajinja Yakata | ART | Nagano Prefecture |
| Kose Yashiki (Kai) | ART | Yamanashi Prefecture |
| Kosema Castle | ART | Aichi Prefecture |
| Koshibami Castle | ART | Nagano Prefecture |
| Koshigoe Castle | Eric | Saitama Prefecture |
| Koshikou Castle (Chikuma) | ART | Nagano Prefecture |
| Kosobu Yakata | ART | Nagano Prefecture |
| Kosodeonzakijinja Castle | ART | Yamanashi Prefecture |
| Kosuge Castle | ART | Yamanashi Prefecture |
| Kosugeyama Yakata | ART | Nagano Prefecture |
| Koteshiro Fort | ART | Yamanashi Prefecture |
| Kotsukuri Castle | ART | Mie Prefecture |
| Kotsukuriko Castle | ART | Mie Prefecture |
| Koudaiji Fort | ART | Yamanashi Prefecture |
| Kouji Yakata | ART | Nagano Prefecture |
| Koujin'o Castle | ART | Nagano Prefecture |
| Koujin'yama Castle (Ina) | ART | Nagano Prefecture |
| Koujin'yama Noroshidai | ART | Yamanashi Prefecture |
| Kouka Saburo Yashiki | ART | Yamanashi Prefecture |
| Koumyo Castle | ART | Shizuoka Prefecture |
| Koumyoji Yakata | ART | Nagano Prefecture |
| Kouno Yashiki (Kai) | ART | Yamanashi Prefecture |
| Kounomine Castle | ART | Yamaguchi Prefecture |
| Kounoshou Castle (Omi) | ART | Shiga Prefecture |
| Kouriki Castle (Mikawa) | ART | Aichi Prefecture |
| Kouyama Castle (Bingo) | ART | Hiroshima Prefecture |
| Kouyama Castle (Nagato) | ART | Yamaguchi Prefecture |
| Koya Castle | ART | Nagano Prefecture |
| Koya Castle (Chikuma) | ART | Nagano Prefecture |
| Koyaba Castle | ART | Nagano Prefecture |
| Koyama Castle | Eric | Shizuoka Prefecture |
| Koyama Castle (Kai) | ART | Yamanashi Prefecture |
| Koyamura Yashiki | ART | Nagano Prefecture |
| Kozubeta Castle | ART | Mie Prefecture |
| Kozukue Castle | Eric | Kanagawa Prefecture |
| Kozutsumi Castle | ART | Shiga Prefecture |
| Kubo Castle (Mikawa) | ART | Aichi Prefecture |
| Kubodera Castle | ART | Nagano Prefecture |
| Kubodono Yashiki | ART | Nagano Prefecture |
| Kuboe Castle (Omi) | ART | Shiga Prefecture |
| Kubota Castle | Frank T. | Akita Prefecture |
| Kubota Castle (Nukata) | ART | Aichi Prefecture |
| Kuboyashiki (Koka) | Eric | Shiga Prefecture |
| Kuboyashikishi Castle (Koka) | Eric | Shiga Prefecture |
| Kugo Castle (Mikawa) | ART | Aichi Prefecture |
| Kukuri Castle | ART | Gifu Prefecture |
| Kukyudaira Castle (Mikawa) | ART | Aichi Prefecture |
| Kuma Castle | Eric | Yamanashi Prefecture |
| Kumagawa Castle | Eric | Fukui Prefecture |
| Kumagawa Jinya | Eric | Fukui Prefecture |
| Kumagura Yakata | ART | Nagano Prefecture |
| Kumamoto Castle | Eric | Kumamoto Prefecture |
| Kunaishoyu Castle | Eric | Kyoto |
| Kuniyoshi Castle | ART | Fukui Prefecture |
| Kuno Castle | ART | Shizuoka Prefecture |
| Kunohe Castle | Eric | Iwate Prefecture |
| Kunori Yakata | ART | Shiga Prefecture |
| Kunou Castle | ART | Shizuoka Prefecture |
| Kurahone Castle | ART | Nagano Prefecture |
| Kuraji Castle (Koka) | Eric | Shiga Prefecture |
| Kuranomae Fort | ART | Yamanashi Prefecture |
| Kurata Castle (Ina) | ART | Nagano Prefecture |
| Kurihara Yakata | ART | Yamanashi Prefecture |
| Kurita Castle | ART | Nagano Prefecture |
| Kuriyagawa no Saku | ART | Iwate Prefecture |
| Kurobane Castle | ART | Tochigi Prefecture |
| Kuroda Daikansho | ART | Shizuoka Prefecture |
| Kuroi Castle | Andrew A | Hyogo Prefecture |
| Kurokawashi Castle (Koka) | Eric | Shiga Prefecture |
| Kurono Castle | ART | Gifu Prefecture |
| Kuruma Castle | ART | Nagano Prefecture |
| Kuruma Castle (Hanishina) | ART | Nagano Prefecture |
| Kurumayama Castle (Hanishina) | ART | Nagano Prefecture |
| Kurume Castle | ART | Fukuoka Prefecture |
| Kururi Castle | Eric | Chiba Prefecture |
| Kusama Bizennokami Yakata | ART | Nagano Prefecture |
| Kushiki Castle (Chikuma) | ART | Nagano Prefecture |
| Kushima Castle | Kyushudan | Nagasaki Prefecture |
| Kushizaki Castle | ART | Yamaguchi Prefecture |
| Kutsukake Castle | Eric | Aichi Prefecture |
| Kutsukakemura Fort | ART | Aichi Prefecture |
| Kutsuki Izuminokami Jin'ya | ART | Shiga Prefecture |
| Kutsuki Shuzen Jin'ya | ART | Shiga Prefecture |
| Kuwabara Castle | Eric | Nagano Prefecture |
| Kuwagatahara Noroshidai | ART | Nagano Prefecture |
| Kuwai Castle (Mikawa) | ART | Aichi Prefecture |
| Kuwana Castle | RaymondW | Mie Prefecture |
| Kyara Palace | ART | Iwate Prefecture |
| Kyotoshin Castle | ART | Kyoto |
| Kyouraishi Yashiki | ART | Yamanashi Prefecture |
| Kyouraishiminbu Yakata | ART | Yamanashi Prefecture |
| Machimura Fort | ART | Nagano Prefecture |
| Machita Yakata | ART | Nagano Prefecture |
| Maebashi Castle | Eric | Gunma Prefecture |
| Maeda Battery | ART | Yamaguchi Prefecture |
| Maenoyama Noroshidai | ART | Yamanashi Prefecture |
| Magaribuchi Yashiki | ART | Yamanashi Prefecture |
| Magome Castle | ART | Gifu Prefecture |
| Majino Castle (Kai) | ART | Yamanashi Prefecture |
| Majinooyashiki Yakata | ART | Nagano Prefecture |
| Makabe Castle | Eric | Ibaraki Prefecture |
| Makabe Jinya | Eric | Ibaraki Prefecture |
| Makino Castle (Mikawa) | ART | Aichi Prefecture |
| Makita Castle (Ise) | ART | Mie Prefecture |
| Mamabe Castle | ART | Nagano Prefecture |
| Mamushizuka Castle | ART | Shizuoka Prefecture |
| Mamyoda Fort | ART | Yamanashi Prefecture |
| Manago Castle | Eric | Tochigi Prefecture |
| Mariko Castle | Eric | Shizuoka Prefecture |
| Marikoyama Fort | ART | Nagano Prefecture |
| Marugame Castle | | Kagawa Prefecture |
| Marune Castle | ART | Aichi Prefecture |
| Marune Fort | Eric | Aichi Prefecture |
| Maruoka Castle | Eric | Fukui Prefecture |
| Maruoka Castle (Koka) | Eric | Shiga Prefecture |
| Maruoka Castle (Uzen) | ART | Yamagata Prefecture |
| Maruyama Castle (Ina) | ART | Nagano Prefecture |
| Maruyama Douen Castle | ART | Aichi Prefecture |
| Maruyama Fort (Ina) | ART | Nagano Prefecture |
| Maruyama Fort (Kai) | ART | Yamanashi Prefecture |
| Maruyama Mandaira Yakata | ART | Nagano Prefecture |
| Maruyama Noroshidai (Suwa) | ART | Nagano Prefecture |
| Maruyama Noutou Castle | ART | Aichi Prefecture |
| Maruyama Tonomura Yakata | ART | Nagano Prefecture |
| Maruyama Yakata | ART | Nagano Prefecture |
| Masugata Castle (Minochi) | ART | Nagano Prefecture |
| Masugata Castle (Musashi) | ART | Kanagawa Prefecture |
| Masugata Castle (Suwa) | ART | Nagano Prefecture |
| Masugata Castle (Takai) | ART | Nagano Prefecture |
| Masugatayama Castle | Eric | Tokyo |
| Masujima Castle | ART | Gifu Prefecture |
| Masuo Castle | Eric | Chiba Prefecture |
| Matsubara Battery (Obama Domain) | ART | Fukui Prefecture |
| Matsubara Castle (Omi) | ART | Shiga Prefecture |
| Matsuda Yakata | ART | Nagano Prefecture |
| Matsudai Castle (Echigo) | ART | Niigata Prefecture |
| Matsudaira Castle | Eric | Aichi Prefecture |
| Matsudaira Yakata | Eric | Aichi Prefecture |
| Matsue Castle | Eric | Shimane Prefecture |
| Matsugasaki Castle (Yamashiro) | Eric | Kyoto |
| Matsugashima Castle | ART | Mie Prefecture |
| Matsugashita Battery (Obama Domain) | ART | Fukui Prefecture |
| Matsuho Battery | ART | Hyogo Prefecture |
| Matsuida Castle | Eric | Gunma Prefecture |
| Matsukura Castle | ART | Gifu Prefecture |
| Matsumae Castle | VicA | Hokkaido |
| Matsumoto Castle | Eric | Nagano Prefecture |
| Matsumoto Castle (Ise) | ART | Mie Prefecture |
| Matsuo Castle | Eric | Nagano Prefecture |
| Matsuo Castle (Ina) | ART | Nagano Prefecture |
| Matsuoyama Castle | ART | Gifu Prefecture |
| Matsusaka Castle | Eric | Mie Prefecture |
| Matsushima Castle (Ina) | ART | Nagano Prefecture |
| Matsushiro Castle | Eric | Nagano Prefecture |
| Matsuyama Castle (Gunma) | Eric | Gunma Prefecture |
| Matsuyama Castle (Saitama) | Eric | Saitama Prefecture |
| Mayamahigashi Castle | ART | Gunma Prefecture |
| Meiseireijin Fort | ART | Nagano Prefecture |
| Mekada Castle | ART | Shiga Prefecture |
| Mibu Castle | ART | Tochigi Prefecture |
| Mibuno Castle (Iga) | 豪谷 | Mie Prefecture |
| Michibayashi Fort | ART | Nagano Prefecture |
| Michikusa Fort | ART | Nagano Prefecture |
| Mie Castle | RaymondW | Okinawa Prefecture |
| Migawa Castle (Hitachi) | AnneMcL | Ibaraki Prefecture |
| Mihara Castle | Eric | Hiroshima Prefecture |
| Miharu Castle | ART | Fukushima Prefecture |
| Mikawa Kou Jin'ya | ART | Aichi Prefecture |
| Mikazuki Jin'ya | Eric | Hyogo Prefecture |
| Miki Castle | Andrew A | Hyogo Prefecture |
| Mikka Castle (Minochi) | ART | Nagano Prefecture |
| Mikkaichiba Castle | ART | Nagano Prefecture |
| Mikkaichiba Yakata | ART | Nagano Prefecture |
| Mikoshiyama Castle | Eric | Shiga Prefecture |
| Mikumo Castle (Koka) | Eric | Shiga Prefecture |
| Minagawa Castle | Eric | Tochigi Prefecture |
| Minagawa Jin'ya (Totomi) | ART | Shizuoka Prefecture |
| Minakuchi Castle | Eric | Shiga Prefecture |
| Minakuchi Okayama Castle | ART | Shiga Prefecture |
| Minami Hatta Castle | Eric | Kyoto |
| Minami Kumai Castle | ART | Nagano Prefecture |
| Minami Majino Castle | ART | Nagano Prefecture |
| Minami Sakaide Castle | ART | Ibaraki Prefecture |
| Minami Tsuda Castle | ART | Shiga Prefecture |
| Minami Wakamiko Castle | ART | Yamanashi Prefecture |
| Minamiohshio Castle (Suwa) | ART | Nagano Prefecture |
| Minamoto Yoshikiyo Yakata | ART | Yamanashi Prefecture |
| Minamoto no Tsunemoto Yakata | Eric | Saitama Prefecture |
| Minato Castle | Eric | Akita Prefecture |
| Minebata Castle | ART | Nagano Prefecture |
| Minegadou Castle | ART | Kyoto |
| Minokubi Castle | ART | Miyagi Prefecture |
| Minowa Castle | Eric | Gunma Prefecture |
| Minowa Castle (Ina) | ART | Nagano Prefecture |
| Minton Castle | RaymondW | Okinawa Prefecture |
| Misaka Castle | ART | Yamanashi Prefecture |
| Misaki Castle (Kuwana) | ART | Mie Prefecture |
| Misayama Castle | ART | Nagano Prefecture |
| Misonoko Castle | ART | Nagano Prefecture |
| Mitake Castle (Kai) | ART | Yamanashi Prefecture |
| Mito Castle | Eric | Ibaraki Prefecture |
| Mitobe Yashiki | ART | Nagano Prefecture |
| Mitsugi Castle (Mikawa) | ART | Aichi Prefecture |
| Mitsui Ichibee Yashiki | ART | Yamanashi Prefecture |
| Mitsui Ukonnojou Yashiki | ART | Yamanashi Prefecture |
| Miyachi Yashiki | ART | Aichi Prefecture |
| Miyachifuru Yashiki | ART | Aichi Prefecture |
| Miyahara Castle | ART | Nagano Prefecture |
| Miyaishi Castle | ART | Aichi Prefecture |
| Miyanoue Castle (Saku) | ART | Nagano Prefecture |
| Miyao Castle | Furinkazan | Hiroshima Prefecture |
| Miyashita Yakata | ART | Nagano Prefecture |
| Mizuban Castle | ART | Nagano Prefecture |
| Mizukami Mondo Yashiki | ART | Yamanashi Prefecture |
| Mizuki | ART | Fukuoka Prefecture |
| Mizusawa Castle | ART | Iwate Prefecture |
| Mizusawa Yashiki (Sarashina) | ART | Nagano Prefecture |
| Mizutake Castle (Mikawa) | ART | Aichi Prefecture |
| Mochibuku Castle | ART | Mie Prefecture |
| Mochikoshi Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Mochizuki Castle (Koka) | Eric | Shiga Prefecture |
| Mochizuki Castle (Saku) | ART | Nagano Prefecture |
| Mochizukishi Castle (Koka) | Eric | Shiga Prefecture |
| Mogusa Castle | Eric | Tokyo |
| Moji Castle | 豪谷 | Fukuoka Prefecture |
| Momochi Tamba Castle | 豪谷 | Mie Prefecture |
| Momose Jin'ya | ART | Nagano Prefecture |
| Momose Yashiki | ART | Nagano Prefecture |
| Mondo Castle (Azumi) | ART | Nagano Prefecture |
| Monjuyama Castle | ART | Aichi Prefecture |
| Monnouchi Yashiki (Yatsushiro) | ART | Yamanashi Prefecture |
| Monomi Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Mori Castle (Hoi) | ART | Aichi Prefecture |
| Mori Castle (Mikawa) | ART | Aichi Prefecture |
| Moriguchi Castle | ART | Osaka |
| Morioka Castle | Eric | Iwate Prefecture |
| Moriya Castle | Eric | Ibaraki Prefecture |
| Moriyama Castle | ART | Fukushima Prefecture |
| Moriyama Castle (Izu) | ART | Shizuoka Prefecture |
| Moriyama Castle (Owari) | ART | Aichi Prefecture |
| Moroto Castle | Eric | Chiba Prefecture |
| Motai Castle (Hanishina) | ART | Nagano Prefecture |
| Moto Castle (Chikuma) | ART | Nagano Prefecture |
| Motodoriyama Castle | ART | Nagano Prefecture |
| Motodoriyamako Castle | ART | Nagano Prefecture |
| Motohori Yakata | ART | Nagano Prefecture |
| Motojuku Castle | ART | Aichi Prefecture |
| Motojuku Jin'ya | ART | Aichi Prefecture |
| Motojukushiro Yashiki | ART | Aichi Prefecture |
| Motosakura Castle | Eric | Chiba Prefecture |
| Motosu Castle | Eric | Yamanashi Prefecture |
| Motoyama Castle (Chikuma) | ART | Nagano Prefecture |
| Motoyama Yakata | ART | Nagano Prefecture |
| Mukade Castle | 豪谷 | Gifu Prefecture |
| Mukaihaguroyama Castle | Eric | Fukushima Prefecture |
| Mukaijima Castle | ART | Kyoto |
| Mumo Castle | Eric | Tochigi Prefecture |
| Murai Koya Castle | ART | Nagano Prefecture |
| Murakami Castle | Eric | Niigata Prefecture |
| Murakami Yakata | ART | Nagano Prefecture |
| Murakamishishima Yakata | ART | Nagano Prefecture |
| Muramatsu Castle | ART | Niigata Prefecture |
| Muraoka Castle (Ina) | ART | Nagano Prefecture |
| Murasame Castle (Koka) | Eric | Shiga Prefecture |
| Muro Castle | ART | Aichi Prefecture |
| Mutsuna Castle (Mikawa) | ART | Aichi Prefecture |
| Myodaiji Castle | ART | Aichi Prefecture |
| Myodaijiko Castle | ART | Aichi Prefecture |
| Myogi Castle | ART | Nagano Prefecture |
| Myogiyama Noroshidai | ART | Nagano Prefecture |
| Myoken Yashiki | ART | Aichi Prefecture |
| Myokenji Castle | ART | Kyoto |
| Myokenji Jinsho | ART | Fukui Prefecture |
| Myokian Yakata | ART | Nagano Prefecture |
| Nabari Jinya | Andrew A | Mie Prefecture |
| Nabebuta Castle | ART | Nagano Prefecture |
| Nabekura Castle | | Iwate Prefecture |
| Nabeyama Castle (Nagato) | ART | Yamaguchi Prefecture |
| Nabeyamajou Fort | ART | Nagano Prefecture |
| Naegi Castle | | Gifu Prefecture |
| Nagabayashi Fort | ART | Nagano Prefecture |
| Nagahama Castle | Eric | Shiga Prefecture |
| Nagahara Castle | ART | Shiga Prefecture |
| Nagai Castle (Mikawa) | ART | Aichi Prefecture |
| Nagaikeyama Fort | ART | Niigata Prefecture |
| Nagakubo Castle | Eric | Shizuoka Prefecture |
| Nagakute Castle | ART | Aichi Prefecture |
| Nagamatsu Castle (Mino) | ART | Gifu Prefecture |
| Nagamine Fort | ART | Yamanashi Prefecture |
| Naganuma Castle (Shinano) | ART | Nagano Prefecture |
| Nagao Castle (Azumi) | ART | Nagano Prefecture |
| Nagaoka Castle | ART | Niigata Prefecture |
| Nagaoka Castle (Omi) | ART | Shiga Prefecture |
| Nagasaka Yashiki | ART | Aichi Prefecture |
| Nagasakaue Fort | ART | Nagano Prefecture |
| Nagasawa Castle | ART | Aichi Prefecture |
| Nagasawa Daikakuji Castle | ART | Aichi Prefecture |
| Nagasawa Jin'ya | ART | Aichi Prefecture |
| Nagasawa Kannondou Castle | ART | Aichi Prefecture |
| Nagasawa Palace | ART | Aichi Prefecture |
| Nagasawa Yadahime Yashiki | ART | Aichi Prefecture |
| Nagase Yakata | ART | Nagano Prefecture |
| Nagashima Castle | ART | Mie Prefecture |
| Nagashino Castle | Eric | Aichi Prefecture |
| Nagata Jin'ya | Eric | Saitama Prefecture |
| Nagaune Fort | ART | Gunma Prefecture |
| Nagayama Castle (Ina) | ART | Nagano Prefecture |
| Nagayama Castle (Suo) | ART | Yamaguchi Prefecture |
| Nagi Castle | ART | Osaka |
| Nagisa Castle | ART | Nagano Prefecture |
| Nagoya Castle | Eric | Aichi Prefecture |
| Nagurumi Castle | Eric | Gunma Prefecture |
| Najima Castle | ART | Fukuoka Prefecture |
| Naka Castle | Eric | Saitama Prefecture |
| Nakaara Castle | Eric | Shimane Prefecture |
| Nakagaitofuru Yashiki | ART | Aichi Prefecture |
| Nakagane Yashiki | ART | Aichi Prefecture |
| Nakagayahori Yashiki | ART | Nagano Prefecture |
| Nakagome Castle (Ina) | ART | Nagano Prefecture |
| Nakagoshoshugo Yakata | ART | Nagano Prefecture |
| Nakagusuku Castle | | Okinawa Prefecture |
| Nakahara Yakata | ART | Nagano Prefecture |
| Nakahokkyu Castle | ART | Aichi Prefecture |
| Nakaizumi Jin'ya | ART | Shizuoka Prefecture |
| Nakajima Castle (Azumi) | ART | Nagano Prefecture |
| Nakajima Fort | Eric | Aichi Prefecture |
| Nakajou Yakata (Chikuma) | ART | Nagano Prefecture |
| Nakajouikenotaira Fort | ART | Nagano Prefecture |
| Nakakaido Yakata | ART | Nagano Prefecture |
| Nakamaki Castle | ART | Yamanashi Prefecture |
| Nakamura Castle | Furinkazan | Kochi Prefecture |
| Nakamura Castle (Azumi) | ART | Nagano Prefecture |
| Nakamura Castle (Soma) | ART | Fukushima Prefecture |
| Nakamura Yakata | ART | Nagano Prefecture |
| Nakamura Yashiki (Yamanashi) | ART | Yamanashi Prefecture |
| Nakamura Yashiki (Yatsushiro) | ART | Yamanashi Prefecture |
| Nakamuranotonoda Yakata | ART | Nagano Prefecture |
| Nakano Castle (Chiisagata) | ART | Nagano Prefecture |
| Nakano Castle (Kai) | ART | Yamanashi Prefecture |
| Nakano Jin'ya | ART | Nagano Prefecture |
| Nakanojin Castle | ART | Nagano Prefecture |
| Nakanojou Jin'ya | ART | Nagano Prefecture |
| Nakanomiyama Castle | ART | Gifu Prefecture |
| Nakao Castle (Chiisagata) | ART | Nagano Prefecture |
| Nakao Castle (Kai) | ART | Yamanashi Prefecture |
| Nakao Castle (Yamashiro) | Eric | Kyoto |
| Nakasai Castle | ART | Ibaraki Prefecture |
| Nakata Yashiki | ART | Nagano Prefecture |
| Nakato Castle (Omi) | ART | Shiga Prefecture |
| Nakatou Castle | ART | Nagano Prefecture |
| Nakatsu Castle | Raffi | Oita Prefecture |
| Nakatsumori Yakata | ART | Yamanashi Prefecture |
| Nakayama Castle (Suwa) | ART | Nagano Prefecture |
| Nakayama Fort | ART | Nagano Prefecture |
| Nakayama Fort (Mikawa) | ART | Aichi Prefecture |
| Nakayamaniyama Fort | ART | Nagano Prefecture |
| Nakazaki Yashiki | ART | Ibaraki Prefecture |
| Nakazawa Castle (Minochi) | ART | Nagano Prefecture |
| Nakazawa Yashiki (Kai) | ART | Yamanashi Prefecture |
| Nakijin Castle | | Okinawa Prefecture |
| Namazue Castle | ART | Shiga Prefecture |
| Namioka Castle | Eric | Aomori Prefecture |
| Nanao Castle | Eric | Ishikawa Prefecture |
| Nanao Castle (Iwami) | AnneMcL | Shimane Prefecture |
| Nanbata Castle | Eric | Saitama Prefecture |
| Nanjou Yakata | ART | Shizuoka Prefecture |
| Nanokaichi Jin'ya | ART | Gunma Prefecture |
| Nanzan Castle | RaymondW | Okinawa Prefecture |
| Narai Castle | ART | Nagano Prefecture |
| Nariai Yakata | ART | Nagano Prefecture |
| Narisawa Castle | Eric | Yamagata Prefecture |
| Narisawa Noroshidai | ART | Yamanashi Prefecture |
| Narukami Castle (Chikuma) | ART | Nagano Prefecture |
| Narumi Castle | Eric | Aichi Prefecture |
| Naruse Castle (Asuke) | ART | Aichi Prefecture |
| Nasu Kanda Castle | Eric | Tochigi Prefecture |
| Nata Castle | ART | Ishikawa Prefecture |
| Natsukawa Castle | RaymondW | Okayama Prefecture |
| Natsumichi Fort | ART | Nagano Prefecture |
| Natsuyama Castle | ART | Aichi Prefecture |
| Ne Castle | Eric | Aomori Prefecture |
| Nechi Castle | ART | Niigata Prefecture |
| Nechi Kamijouyama Castle | ART | Niigata Prefecture |
| Nechi Kuriyama Castle | ART | Niigata Prefecture |
| Negoya Castle | Eric | Gunma Prefecture |
| Negoya Castle (Sanada) | ART | Nagano Prefecture |
| Nemoto Castle | ART | Gifu Prefecture |
| Nemotogoten Yashiki | ART | Gifu Prefecture |
| Nemunoki Castle (Mikawa) | ART | Aichi Prefecture |
| Nemuro Hanto Chashi Ato Gun | Onnajoshu | Hokkaido |
| Nezumiana Castle | ART | Nagano Prefecture |
| Nezumiana Yakata | ART | Nagano Prefecture |
| Nihonmatsu Castle | Eric | Fukushima Prefecture |
| Niijiro Fort | ART | Yamanashi Prefecture |
| Niitakayama Castle | Eric | Hiroshima Prefecture |
| Niiya Castle (Kouzuke) | ART | Gunma Prefecture |
| Nijo Castle | Eric | Kyoto |
| Nijo Castle (Tochigi) | Eric | Tochigi Prefecture |
| Nijoko Castle | ART | Kyoto |
| Nikaidou Yakata | ART | Yamanashi Prefecture |
| Nikki Castle (Nukata) | ART | Aichi Prefecture |
| Ninomiya Castle (Musashi) | ART | Tokyo |
| Nirasaki Jin'ya | ART | Yamanashi Prefecture |
| Nirayama Castle | Eric | Shizuoka Prefecture |
| Nirayama Daikansho | ART | Shizuoka Prefecture |
| Nirekubo Yakata | ART | Nagano Prefecture |
| Nirengi Castle | ART | Aichi Prefecture |
| Nishi Aoki Castle | ART | Shiga Prefecture |
| Nishi Kuramae Castle | ART | Aichi Prefecture |
| Nishi Sakabe Castle | ART | Mie Prefecture |
| Nishi Wada Castle | ART | Nagano Prefecture |
| Nishiachiwa Castle (Mikawa) | ART | Aichi Prefecture |
| Nishijou Castle | ART | Nagano Prefecture |
| Nishijou Castle (Chikuma) | ART | Nagano Prefecture |
| Nishikata Castle | Eric | Tochigi Prefecture |
| Nishikawa Yashiki (Kai) | ART | Yamanashi Prefecture |
| Nishimaki Castle (Azumi) | ART | Nagano Prefecture |
| Nishina Castle | ART | Nagano Prefecture |
| Nishinahon Castle | ART | Nagano Prefecture |
| Nishinohara Fort | ART | Yamanashi Prefecture |
| Nishio Castle | Eric | Aichi Prefecture |
| Nishiohhira Jin'ya | 豪谷 | Aichi Prefecture |
| Nishiyama Castle (Azumi) | ART | Nagano Prefecture |
| Nishiyama Castle (Chiisagata) | ART | Nagano Prefecture |
| Nitchu Castle | ART | Toyama Prefecture |
| Niwase Castle | RaymondW | Okayama Prefecture |
| Niwaya Castle (Kozuke) | ART | Gunma Prefecture |
| Nobata Castle (Mikawa) | ART | Aichi Prefecture |
| Nobeoka Castle | Frank T. | Miyazaki Prefecture |
| Nobutora Tanjou Yashiki | ART | Yamanashi Prefecture |
| Nochiseyama Castle | RaymondW | Fukui Prefecture |
| Noda Castle (Hekikai) | ART | Aichi Prefecture |
| Noda Castle (Settsu) | ART | Osaka |
| Noda Castle (Shitara) | ART | Aichi Prefecture |
| Noge Yakata | Eric | Kyoto |
| Noguchi Castle (Mikawa) | ART | Aichi Prefecture |
| Noguchi Kaminoyama Castle | ART | Aichi Prefecture |
| Noguchi Yakata | ART | Gifu Prefecture |
| Noji Castle | ART | Shizuoka Prefecture |
| Nomi Castle (Nukata) | ART | Aichi Prefecture |
| Nomura Castle (Tanba) | ART | Hyogo Prefecture |
| Nomura Fort | ART | Nagano Prefecture |
| Nomura Jin'ya (Mino) | ART | Gifu Prefecture |
| Nomura Yakata | ART | Nagano Prefecture |
| Norisada Castle | ART | Aichi Prefecture |
| Norisada Jin'ya | ART | Aichi Prefecture |
| Norisada Kobata Castle | ART | Aichi Prefecture |
| Nosezakanishi Castle | ART | Yamanashi Prefecture |
| Notose Castle (Omi) | ART | Shiga Prefecture |
| Nouken Castle | ART | Yamanashi Prefecture |
| Nouken Dousaka Fort | ART | Yamanashi Prefecture |
| Nouken Kurokoma Fort | ART | Yamanashi Prefecture |
| Nouken Nishi Fort | ART | Yamanashi Prefecture |
| Nozaki Castle | Eric | Osaka |
| Nubaku Yakata | ART | Yamanashi Prefecture |
| Numata Castle | Eric | Gunma Prefecture |
| Numatashi Dejiro | Eric | Fukui Prefecture |
| Nyoigatake Castle | Eric | Kyoto |
| Nyunomi Castle | ART | Nagano Prefecture |
| Oba Castle | Eric | Kanagawa Prefecture |
| Obama Castle | RaymondW | Fukui Prefecture |
| Obama Castle (Iwashiro) | ART | Fukushima Prefecture |
| Obara Castle | ART | Ibaraki Prefecture |
| Obaraichiba Castle | 豪谷 | Aichi Prefecture |
| Obata Castle | Eric | Ibaraki Prefecture |
| Obata Castle (Tanba) | Eric | Kyoto |
| Obata Jin'ya | Eric | Gunma Prefecture |
| Obi Castle | Frank T. | Miyazaki Prefecture |
| Obiki Castle | Eric | Nagano Prefecture |
| Obinata Samon Yakata | ART | Nagano Prefecture |
| Obu Yashiki (Kai) | ART | Yamanashi Prefecture |
| Ochaya Yashiki | ART | Gifu Prefecture |
| Ochiai Fort | ART | Gifu Prefecture |
| Ochiai Yakata | ART | Yamanashi Prefecture |
| Ochiai Yashiki | ART | Yamanashi Prefecture |
| Ochiai Yashiki (Ochiai) | ART | Yamanashi Prefecture |
| Oda Castle | Eric | Ibaraki Prefecture |
| Odaka Castle | RaymondW | Aichi Prefecture |
| Odani Castle | | Shiga Prefecture |
| Odano Castle | Eric | Tokyo |
| Odano Castle (Kai) | ART | Yamanashi Prefecture |
| Odatsuno Yakata | ART | Nagano Prefecture |
| Odawara Castle | Eric | Kanagawa Prefecture |
| Odayama Castle (Aizu) | ART | Fukushima Prefecture |
| Odoi | ART | Kyoto |
| Odori Castle | Eric | Saitama Prefecture |
| Odoriba Fort | ART | Nagano Prefecture |
| Ogaki Castle | Eric | Gifu Prefecture |
| Ogawa Castle | Eric | Gunma Prefecture |
| Ogawa Castle (Koka) | Eric | Shiga Prefecture |
| Ogawa Castle (Musashi) | ART | Tokyo |
| Ogawa Castle (Omi) | ART | Shiga Prefecture |
| Ogawa Castle (Owari) | ART | Aichi Prefecture |
| Ogawa Nakanojo Castle (Koka) | Eric | Shiga Prefecture |
| Ogawa Nishinojo Castle (Koka) | Eric | Shiga Prefecture |
| Ogawamatobaoka Castle | ART | Aichi Prefecture |
| Ogawara Yakata | ART | Nagano Prefecture |
| Ogawashimo Castle | ART | Aichi Prefecture |
| Ogi Castle (Nukata) | ART | Aichi Prefecture |
| Ogimachi Castle | Eric | Gifu Prefecture |
| Ogiwara Castle (Azumi) | ART | Nagano Prefecture |
| Ogiwara Yakata (Azumi) | ART | Nagano Prefecture |
| Ogoe Castle | ART | Fukushima Prefecture |
| Oguchi Castle | ART | Aichi Prefecture |
| Ogura Castle | Eric | Saitama Prefecture |
| Ogura Castle (Azumi) | ART | Nagano Prefecture |
| Ogura Castle (Omi) | ART | Shiga Prefecture |
| Ogurayama Castle | ART | Gifu Prefecture |
| Ogurayamagami Castle | ART | Shiga Prefecture |
| Oguro Castle (Ina) | ART | Nagano Prefecture |
| Ogyu Castle | Eric | Aichi Prefecture |
| Ogyuyamanaka Castle | ART | Aichi Prefecture |
| Oh'eda Castle | ART | Fukushima Prefecture |
| Oh'ide Castle | ART | Nagano Prefecture |
| Oh'idefuru Castle | ART | Nagano Prefecture |
| Oh'ikemurayama Castle | ART | Nagano Prefecture |
| Oh'ino Castle (Mikawa) | ART | Aichi Prefecture |
| Oh'iwa Castle | ART | Nagano Prefecture |
| Oh'uchi Yakata | ART | Yamaguchi Prefecture |
| Oh'yama no Saku | ART | Yamagata Prefecture |
| Ohbayashi Yashiki | ART | Yamanashi Prefecture |
| Ohdairashin Castle (Izu) | ART | Shizuoka Prefecture |
| Ohdate | Eric | Akita Prefecture |
| Ohfuji Castle | ART | Nagano Prefecture |
| Ohga Castle | ART | Gifu Prefecture |
| Ohguma Castle | ART | Nagano Prefecture |
| Ohhara Castle | RaymondW | Shiga Prefecture |
| Ohhata Castle (Mikawa) | ART | Aichi Prefecture |
| Ohhira Higashiohmori Castle | ART | Aichi Prefecture |
| Ohhira Okado Castle | ART | Aichi Prefecture |
| Ohhira Saikatsu Castle | ART | Aichi Prefecture |
| Ohhira Tsujishige Castle | ART | Aichi Prefecture |
| Ohkawarashi Castle (Koka) | Eric | Shiga Prefecture |
| Ohkouchi Castle (Mikawa) | ART | Aichi Prefecture |
| Ohkubo Castle (Ina) | ART | Nagano Prefecture |
| Ohkubo Jin'ya (Mikawa) | ART | Aichi Prefecture |
| Ohkunugi Yakata | ART | Yamanashi Prefecture |
| Ohkusa Castle (Chita) | ART | Aichi Prefecture |
| Ohkusa Castle (Mikawa) | ART | Aichi Prefecture |
| Ohmachi Kitahara Yakata | ART | Nagano Prefecture |
| Ohmachi Minamihara Yakata | ART | Nagano Prefecture |
| Ohmatsuyama Castle | Furinkazan | Okayama Prefecture |
| Ohmine Castle | ART | Nagano Prefecture |
| Ohmiya Castle (Suruga) | ART | Shizuoka Prefecture |
| Ohmiyahachiman Yakata | ART | Nagano Prefecture |
| Ohmizo Castle | RaymondW | Shiga Prefecture |
| Ohmizo Jin'ya | Eric | Shiga Prefecture |
| Ohmori Castle | ART | Fukushima Prefecture |
| Ohmori Castle (Mino) | ART | Gifu Prefecture |
| Ohmori Daikansho | ART | Shimane Prefecture |
| Ohmura Yakata | ART | Nagano Prefecture |
| Ohmura Yashiki | ART | Yamanashi Prefecture |
| Ohniwa Castle (Ina) | ART | Nagano Prefecture |
| Ohno Castle (Chikuzen) | ART | Fukuoka Prefecture |
| Ohno Castle (Chita) | ART | Aichi Prefecture |
| Ohno Fort | ART | Yamanashi Prefecture |
| Ohnoda Castle | ART | Aichi Prefecture |
| Ohnoda Castle (Azumi) | ART | Nagano Prefecture |
| Ohnuma Castle | ART | Aichi Prefecture |
| Ohsaki Castle | ART | Nagano Prefecture |
| Ohsakide Castle | ART | Nagano Prefecture |
| Ohsawa Castle (Mikawa) | ART | Aichi Prefecture |
| Ohshima Jin'ya | ART | Aichi Prefecture |
| Ohshio Castle (Azumi) | ART | Nagano Prefecture |
| Ohtaki Castle (Mikawa) | ART | Aichi Prefecture |
| Ohtaridaira Yakata | ART | Nagano Prefecture |
| Ohtawara Castle | ART | Tochigi Prefecture |
| Ohtou Castle | ART | Nagano Prefecture |
| Ohtsu Castle | ART | Shiga Prefecture |
| Ohtsubo Fort | ART | Yamanashi Prefecture |
| Ohtsubono Fort | ART | Yamanashi Prefecture |
| Ohtsuka Moated Settlement | ART | Kanagawa Prefecture |
| Ohtsuma Yakata | ART | Nagano Prefecture |
| Ohwatari Noroshidai | ART | Yamanashi Prefecture |
| Ohyama Dejiro | Eric | Kyoto |
| Ohzuku Castle | ART | Shiga Prefecture |
| Oi Castle (Mikawa) | ART | Aichi Prefecture |
| Oike Fort | ART | Nagano Prefecture |
| Oishi Castle (Bitchu) | ART | Okayama Prefecture |
| Oiwakehikage Castle | ART | Aichi Prefecture |
| Oiwayama Fort | Eric | Shiga Prefecture |
| Ojima Castle (Mikawa) | ART | Aichi Prefecture |
| Ojima Castle (Mino) | ART | Gifu Prefecture |
| Ojima Jin'ya | Eric | Shizuoka Prefecture |
| Oka Castle | Raffi | Oita Prefecture |
| Oka Castle (Mikawa) | 豪谷 | Aichi Prefecture |
| Okada Chikayoshi Yakata | ART | Nagano Prefecture |
| Okami Castle | Eric | Ibaraki Prefecture |
| Okaya Castle (Suwa) | ART | Nagano Prefecture |
| Okayama Castle | Eric | Okayama Prefecture |
| Okayama Jin'ya | ART | Aichi Prefecture |
| Okayama Jinjiro | 豪谷 | Gifu Prefecture |
| Okazaki Castle | Eric | Aichi Prefecture |
| Oki Castle (Koka) | Eric | Shiga Prefecture |
| Okishi Castle III (Koka) | Eric | Shiga Prefecture |
| Okiyama Fort | Eric | Tokyo |
| Okkoshi Castle | Eric | Nagano Prefecture |
| Okkoto Jinjou | ART | Nagano Prefecture |
| Oko Castle | RaymondW | Kochi Prefecture |
| Okudani Castle | Eric | Hyogo Prefecture |
| Okusawa Castle | Eric | Tokyo |
| Okushima Yakata | ART | Shiga Prefecture |
| Okutono Jin'ya | ART | Aichi Prefecture |
| Omagari Yashiki (Kai) | ART | Yamanashi Prefecture |
| Omi Castle | ART | Nagano Prefecture |
| Omi Hachiman Castle | Eric | Shiga Prefecture |
| Omi Yakata | ART | Nagano Prefecture |
| Omifuru Castle | ART | Nagano Prefecture |
| Omono Castle | RaymondW | Okinawa Prefecture |
| Omotegi Castle (Ina) | ART | Nagano Prefecture |
| Onabuchi Castle | Eric | Gunma Prefecture |
| Oniba Castle | ART | Nagano Prefecture |
| Onigajo Castle | Eric | Kyoto |
| Onikuma Yakata | ART | Nagano Prefecture |
| Onjouyama Fort | ART | Nagano Prefecture |
| Ononokozakura Yashiki | ART | Aichi Prefecture |
| Onotougemonomi Fort | ART | Nagano Prefecture |
| Oogo Castle | Eric | Gunma Prefecture |
| Ori Castle | Eric | Gifu Prefecture |
| Orido Castle | ART | Aichi Prefecture |
| Oriji Castle | ART | Aichi Prefecture |
| Oro Castle (Mikawa) | ART | Aichi Prefecture |
| Osada Castle (Omi) | ART | Shiga Prefecture |
| Osade Yashiki | ART | Yamanashi Prefecture |
| Osaka Castle | Eric | Osaka |
| Osaka Castle (Chikuma) | ART | Nagano Prefecture |
| Osaka Castle (Ibaraki) | Eric | Ibaraki Prefecture |
| Osaka Castle (Sarashina) | ART | Nagano Prefecture |
| Osaka Castle (Suwa) | ART | Nagano Prefecture |
| Osakabe Castle | ART | Shizuoka Prefecture |
| Osakatono Yashiki (Suwa) | ART | Nagano Prefecture |
| Oshi Castle | Eric | Saitama Prefecture |
| Oshigane Castle (Minochi) | ART | Nagano Prefecture |
| Oshikamo Castle | ART | Aichi Prefecture |
| Oshino Castle (Azumi) | ART | Nagano Prefecture |
| Oshirohama Battery (Obama Domain) | ART | Fukui Prefecture |
| Ota Castle | Furinkazan | Wakayama Prefecture |
| Otaki Castle | Eric | Chiba Prefecture |
| Otaya Yakata | ART | Nagano Prefecture |
| Otowa Castle | Furinkazan | Shiga Prefecture |
| Ou Castle (Ina) | ART | Nagano Prefecture |
| Ougidairayama Castle | ART | Yamanashi Prefecture |
| Oura Castle | ART | Yamagata Prefecture |
| Owa Castle (Suwa) | ART | Nagano Prefecture |
| Owaribe Castle (Minochi) | ART | Nagano Prefecture |
| Oyamada Bessou Yashiki | ART | Yamanashi Prefecture |
| Oyobiki Yakata | ART | Nagano Prefecture |
| Ozo Yashiki | ART | Yamanashi Prefecture |
| Ozu Castle | Frank T. | Ehime Prefecture |
| Raiden Castle | ART | Nagano Prefecture |
| Reishouzan Castle | ART | Nagano Prefecture |
| Renpou Yashiki | ART | Yamanashi Prefecture |
| Rikan Castle | Ucu_Maksudi | Hyogo Prefecture |
| Rokugawa Jin'ya | ART | Nagano Prefecture |
| Rokuta Yakata | ART | Mie Prefecture |
| Ryuga Castle (Yamashiro) | ART | Kyoto |
| Ryugasaki Castle (Ina) | ART | Nagano Prefecture |
| Ryugasaki Yakata | ART | Nagano Prefecture |
| Ryusenji Castle | ART | Aichi Prefecture |
| Saburouhora Castle (Chikuma) | ART | Nagano Prefecture |
| Saegusa Yashiki | ART | Yamanashi Prefecture |
| Saga Castle | Kyushudan | Saga Prefecture |
| Sagaki Jin'ya | ART | Fukui Prefecture |
| Sagara Castle | ART | Shizuoka Prefecture |
| Saijozan Jinba | ART | Nagano Prefecture |
| Saiki Castle | | Oita Prefecture |
| Saikumafuru Yashiki | ART | Aichi Prefecture |
| Saimyoji Castle | ART | Tochigi Prefecture |
| Sainokami Castle | ART | Aichi Prefecture |
| Saitou Toshiyasu Yakata | ART | Gifu Prefecture |
| Sakaime Castle | ART | Shizuoka Prefecture |
| Sakaki Jin'ya | ART | Nagano Prefecture |
| Sakakikitajou Castle | ART | Nagano Prefecture |
| Sakamoto Castle | RaymondW | Shiga Prefecture |
| Sakasai Castle | Eric | Ibaraki Prefecture |
| Sakasou Castle (Mikawa) | ART | Aichi Prefecture |
| Sakata Castle | Eric | Chiba Prefecture |
| Sakata Castle (Chikuzen) | ART | Fukuoka Prefecture |
| Sakato Castle (Mikawa) | ART | Aichi Prefecture |
| Sakayori Masamoto Yashiki | ART | Yamanashi Prefecture |
| Sakazaki Castle (Mikawa) | ART | Aichi Prefecture |
| Sakazakiko Castle (Mikawa) | ART | Aichi Prefecture |
| Saku Castle | ART | Shizuoka Prefecture |
| Sakuma Yakata | ART | Nagano Prefecture |
| Sakura Castle | Eric | Chiba Prefecture |
| Sakura Castle (Aichi) | Eric | Aichi Prefecture |
| Sakura Castle (Suwa) | ART | Nagano Prefecture |
| Sakurabasama Castle | ART | Shiga Prefecture |
| Sakurabasamade Castle | ART | Shiga Prefecture |
| Sakurabora Castle | 豪谷 | Gifu Prefecture |
| Sakurai Castle | ART | Aichi Prefecture |
| Sakurai Nobutada Yashiki | ART | Yamanashi Prefecture |
| Sakurasawa Fort | ART | Nagano Prefecture |
| Sakurazakaue Fort | ART | Nagano Prefecture |
| Samegai Castle | ART | Shiga Prefecture |
| Samine Castle (Chikuma) | ART | Nagano Prefecture |
| Samizu Castle | ART | Nagano Prefecture |
| Sanada Palace | Eric | Nagano Prefecture |
| Sanada Yashiki (Kai) | ART | Yamanashi Prefecture |
| Sanadahonjo Castle | Eric | Nagano Prefecture |
| Sanadayama Castle | ART | Shizuoka Prefecture |
| Sankouji Fort | ART | Yamanashi Prefecture |
| Sannohe Castle | ART | Aomori Prefecture |
| Sannou Yakata | ART | Nagano Prefecture |
| Sano Castle | Eric | Tochigi Prefecture |
| Sano Castle (Azumi) | ART | Nagano Prefecture |
| Sanokita Yakata | ART | Shiga Prefecture |
| Sanominami Yakata | ART | Shiga Prefecture |
| Saraki Jin'ya | ART | Gifu Prefecture |
| Sarubami Castle | ART | Gifu Prefecture |
| Saruga Castle (Azumi) | ART | Nagano Prefecture |
| Saruga Castle (Chikuma) | ART | Nagano Prefecture |
| Sarugajou Noroshidai | ART | Nagano Prefecture |
| Sarukoya Fort | ART | Nagano Prefecture |
| Sarushima Battery Island | ART | Kanagawa Prefecture |
| Sasaga Castle (Chikuma) | ART | Nagano Prefecture |
| Sasano Castle (Chikuma) | ART | Nagano Prefecture |
| Sasao Castle | Eric | Yamanashi Prefecture |
| Sasayama Castle | Eric | Hyogo Prefecture |
| Sasayama Shuzan Daikansho | Eric | Kyoto |
| Sasazawa Castle (Chikuma) | ART | Nagano Prefecture |
| Sashiki Castle | Frank T. | Kumamoto Prefecture |
| Sasou Castle | Eric | Shiga Prefecture |
| Satsuma Yakata | ART | Nagano Prefecture |
| Sawado Castle | ART | Nagano Prefecture |
| Sawayama Castle | Eric | Shiga Prefecture |
| Sawazoko Horinouchi Yakata | ART | Nagano Prefecture |
| Seba Castle (Sanada) | ART | Nagano Prefecture |
| Segi Castle | ART | Aichi Prefecture |
| Seiganji Castle | ART | Aichi Prefecture |
| Seirin Fort | ART | Nagano Prefecture |
| Seiryuin | Eric | Gunma Prefecture |
| Seiryuji Yakata | ART | Nagano Prefecture |
| Seki Castle (Mino) | ART | Gifu Prefecture |
| Sekidousan Castle | ART | Ishikawa Prefecture |
| Sekinomori Castle | ART | Fukushima Prefecture |
| Sekiyado Castle | Eric | Chiba Prefecture |
| Senda Castle (Minochi) | ART | Nagano Prefecture |
| Sendai Castle | Eric | Miyagi Prefecture |
| Sendatsu Castle | ART | Nagano Prefecture |
| Sengoku Utanosuke Yakata | ART | Nagano Prefecture |
| Sengoku Yakata | ART | Nagano Prefecture |
| Senmi Castle | ART | Nagano Prefecture |
| Senowaki Castle | ART | Nagano Prefecture |
| Senpuku Castle | Eric | Shizuoka Prefecture |
| Sentougamine Castle | ART | Shizuoka Prefecture |
| Setagaya Castle | Eric | Tokyo |
| Shachinomi Jin'ya | ART | Aichi Prefecture |
| Shakujii Castle | Eric | Tokyo |
| Shibata Castle | Eric | Niigata Prefecture |
| Shibukawa Yorii Castle | ART | Gunma Prefecture |
| Shibutami Castle (Azumi) | ART | Nagano Prefecture |
| Shibutami Yakata | ART | Nagano Prefecture |
| Shibuya Castle | Eric | Tokyo |
| Shichinohe Castle | | Aomori Prefecture |
| Shichiri Yakata (Omi) | ART | Shiga Prefecture |
| Shiga Castle | ART | Nagano Prefecture |
| Shiga Yakata | ART | Nagano Prefecture |
| Shigehara Jin'ya | ART | Aichi Prefecture |
| Shigematsu Castle | ART | Aichi Prefecture |
| Shigetsu Fushimi Castle | ART | Kyoto |
| Shigisan Castle | Eric | Nara Prefecture |
| Shigiyama Castle | Eric | Fukushima Prefecture |
| Shii Castle | ART | Aichi Prefecture |
| Shimabara Castle | Raffi | Nagasaki Prefecture |
| Shimada Jin'ya | ART | Aichi Prefecture |
| Shimashi Ozato Castle | RaymondW | Okinawa Prefecture |
| Shimizu Castle | Eric | Tochigi Prefecture |
| Shimizu Jin'ya | ART | Yamanashi Prefecture |
| Shimizu Jin'ya (Fuefuki) | ART | Yamanashi Prefecture |
| Shimizu Nuidonosuke Yashiki | ART | Yamanashi Prefecture |
| Shimizu Yakata (Azumi) | ART | Nagano Prefecture |
| Shimizu Yashiki (Koma) | ART | Yamanashi Prefecture |
| Shimo Castle (Suwa) | ART | Nagano Prefecture |
| Shimo Shinbee Yashiki | ART | Yamanashi Prefecture |
| Shimoasama Yakata | ART | Nagano Prefecture |
| Shimofuri Fort | ART | Nagano Prefecture |
| Shimofuru Castle | ART | Shizuoka Prefecture |
| Shimogatou Yashiki | ART | Yamanashi Prefecture |
| Shimohiraideko Castle (Ina) | ART | Nagano Prefecture |
| Shimohiyoshi Castle (Omi) | ART | Shiga Prefecture |
| Shimomakifuru Castle | ART | Nagano Prefecture |
| Shimomisu Castle | ART | Kyoto |
| Shimono Castle (Ina) | ART | Nagano Prefecture |
| Shimosaka Yakata | ART | Shiga Prefecture |
| Shimotsui Castle | RaymondW | Okayama Prefecture |
| Shimowada Castle | ART | Aichi Prefecture |
| Shimoyama Castle (Kai) | ART | Yamanashi Prefecture |
| Shimoyama Castle (Koka) | Eric | Shiga Prefecture |
| Shimoyama Kita Castle (Koka) | Eric | Shiga Prefecture |
| Shimoyama Yakata | ART | Shiga Prefecture |
| Shimoyashiki Yakata | ART | Nagano Prefecture |
| Shimozato Castle (Omi) | ART | Shiga Prefecture |
| Shimozone Yashiki | ART | Yamanashi Prefecture |
| Shimura Castle | Eric | Tokyo |
| Shimura Castle (Omi) | ART | Shiga Prefecture |
| Shinagawa Battery Islands | Eric | Tokyo |
| Shinagura Castle | ART | Nagano Prefecture |
| Shinano Kawada Yakata | ART | Nagano Prefecture |
| Shingen Yashiki | ART | Yamanashi Prefecture |
| Shingu Castle | Andrew A | Wakayama Prefecture |
| Shingu Castle (Koka) | Eric | Shiga Prefecture |
| Shingu Jin'ya | Eric | Hyogo Prefecture |
| Shingushi Castle (Koka) | Eric | Shiga Prefecture |
| Shinjou Castle (Etchu) | ART | Toyama Prefecture |
| Shinmachiharada Yakata | ART | Nagano Prefecture |
| Shinohara Fort | ART | Yamanashi Prefecture |
| Shinoridate | Rebolforces | Hokkaido |
| Shinpu Castle | Eric | Yamanashi Prefecture |
| Shinpukuji Castle (Mikawa) | ART | Aichi Prefecture |
| Shinshiro Castle | 豪谷 | Aichi Prefecture |
| Shinshiroko Castle | ART | Aichi Prefecture |
| Shioda Castle | ART | Nagano Prefecture |
| Shioda Higashi Fort | ART | Nagano Prefecture |
| Shioda Koubouyama Fort | ART | Nagano Prefecture |
| Shioda Nishi Fort | ART | Nagano Prefecture |
| Shioda Nishibouruigun | ART | Nagano Prefecture |
| Shioda Yakata | ART | Nagano Prefecture |
| Shioda Yashiki | ART | Yamanashi Prefecture |
| Shiogai Castle | Eric | Kyoto |
| Shiojiri Jin'ya | ART | Nagano Prefecture |
| Shiozaki Castle | ART | Nagano Prefecture |
| Shiozaki Miyama Fort | ART | Nagano Prefecture |
| Shiozakishin Castle | ART | Nagano Prefecture |
| Shirahata Castle | Eric | Tochigi Prefecture |
| Shirakawa Castle | Eric | Fukushima Prefecture |
| Shirasawa Fort | ART | Nagano Prefecture |
| Shiratori Castle | Furinkazan | Toyama Prefecture |
| Shirayama Castle (Chiisagata) | ART | Nagano Prefecture |
| Shiroi Castle | Eric | Gunma Prefecture |
| Shiroishi Castle | Eric | Miyagi Prefecture |
| Shirokane Yakata | Eric | Tokyo |
| Shirokoma Castle | ART | Nagano Prefecture |
| Shironomine Castle (Azumi) | ART | Nagano Prefecture |
| Shiroyama Castle (Asuke) | ART | Aichi Prefecture |
| Shiryokaku Fort | RonS | Hokkaido |
| Shishido Jin'ya | ART | Ibaraki Prefecture |
| Shishiku Castle | Eric | Yamanashi Prefecture |
| Shishiudo Castle | Eric | Kyoto |
| Shishiudo Yakata | Eric | Kyoto |
| Shiwa Castle | Eric | Iwate Prefecture |
| Shizugatake Fort | Eric | Shiga Prefecture |
| Shizuhara North Castle | Eric | Kyoto |
| Shizuhara South Castle | Eric | Kyoto |
| Shizuhatayama Castle | ART | Shizuoka Prefecture |
| Shobata Castle | Eric | Aichi Prefecture |
| Shogunyama Castle | Eric | Kyoto |
| Shoryuji Castle | | Kyoto |
| Shou Castle | ART | Nagano Prefecture |
| Shoubudake Castle | ART | Shiga Prefecture |
| Shouda Castle (Mikawa) | ART | Aichi Prefecture |
| Shoudai Noroshidai | ART | Nagano Prefecture |
| Shoufukuji Fort | ART | Yamanashi Prefecture |
| Shougen Yashiki | ART | Yamanashi Prefecture |
| Shoujina Yakata | ART | Nagano Prefecture |
| Shoumanji Fort | ART | Aichi Prefecture |
| Shoutokuji Yakata | ART | Yamanashi Prefecture |
| Shouunji Fort | ART | Yamanashi Prefecture |
| Shouzui Castle | Furinkazan | Tokushima Prefecture |
| Shuri Castle | | Okinawa Prefecture |
| Shuuchi Castle | Eric | Kyoto |
| Shuukouan'ura Battery (Obama Domain) | ART | Fukui Prefecture |
| Shuzan Castle | Eric | Kyoto |
| Sokura Castle (Ina) | ART | Nagano Prefecture |
| Sone Castle (Omi) | ART | Shiga Prefecture |
| Sonobe Castle | ART | Kyoto |
| Soudai Castle | ART | Nagano Prefecture |
| Soudaide Castle | ART | Nagano Prefecture |
| Suda Castle | ART | Nagano Prefecture |
| Suda Yakata | ART | Nagano Prefecture |
| Suda Yakata (Omi) | ART | Shiga Prefecture |
| Suemori Castle | ART | Aichi Prefecture |
| Suganuma Castle (Ina) | ART | Nagano Prefecture |
| Suganuma Castle (Kai) | ART | Yamanashi Prefecture |
| Sugawayama Fort | ART | Shiga Prefecture |
| Sugaya Yakata | Eric | Saitama Prefecture |
| Sugimoto Castle | ART | Kanagawa Prefecture |
| Suginome Castle | ART | Fukushima Prefecture |
| Sugiyama Castle | Eric | Saitama Prefecture |
| Suibara Daikansho | ART | Niigata Prefecture |
| Suikei Okayama Castle | Furinkazan | Shiga Prefecture |
| Suishouzan Encampment | ART | Gifu Prefecture |
| Sukegawakaibou Castle | ART | Ibaraki Prefecture |
| Sumiyoshi Castle (Sagami) | ART | Kanagawa Prefecture |
| Sumoto Castle | Frank T. | Hyogo Prefecture |
| Sunomata Castle | ART | Gifu Prefecture |
| Sunpu Castle | Eric | Shizuoka Prefecture |
| Sunuma Yakata | ART | Nagano Prefecture |
| Suwa Ohhouri Yakata | ART | Nagano Prefecture |
| Suwa Yakata | ART | Nagano Prefecture |
| Suwahara Castle | Eric | Shizuoka Prefecture |
| Suzaka Jin'ya | ART | Nagano Prefecture |
| Suzaki Battery | ART | Fukuoka Prefecture |
| Suzumegamori Noroshidai | ART | Nagano Prefecture |
| Suzuoka Castle (Ina) | ART | Nagano Prefecture |
| Suzuryuyama Fort | ART | Nagano Prefecture |
| Tabeyama Castle | Eric | Shiga Prefecture |
| Taburi Castle | ART | Aichi Prefecture |
| Tada Kasuke Yashiki | ART | Nagano Prefecture |
| Taga Castle | Eric | Miyagi Prefecture |
| Tagamiyama Castle | Eric | Shiga Prefecture |
| Tagayashi Yakata | Eric | Akita Prefecture |
| Tage Castle | Eric | Tochigi Prefecture |
| Tago Castle | ART | Nagano Prefecture |
| Tago Yakata | ART | Nagano Prefecture |
| Taguchi Castle | ART | Nagano Prefecture |
| Taguchi Castle (Mikawa) | ART | Aichi Prefecture |
| Tahara Castle | ART | Aichi Prefecture |
| Taikouji Yakata (Omi) | ART | Shiga Prefecture |
| Taira Yashiki | ART | Yamanashi Prefecture |
| Taishou Encampment (Ena) | ART | Gifu Prefecture |
| Tajimi Castle | ART | Gifu Prefecture |
| Takada Castle (Ina) | ART | Nagano Prefecture |
| Takada Castle (Niigata) | Eric | Niigata Prefecture |
| Takada Castle (Okayama) | | Okayama Prefecture |
| Takadaoh Yashiki | ART | Shizuoka Prefecture |
| Takagi Castle (Suwa) | ART | Nagano Prefecture |
| Takagifuru Castle | ART | Nagano Prefecture |
| Takagiuchi Castle | ART | Nagano Prefecture |
| Takahara Castle (Shinano) | ART | Nagano Prefecture |
| Takahara Castle (Suruga) | ART | Shizuoka Prefecture |
| Takaharasuwa Castle | ART | Gifu Prefecture |
| Takahashi Yakata | ART | Aichi Prefecture |
| Takahata Castle | Eric | Tokyo |
| Takai Castle | Eric | Ibaraki Prefecture |
| Takaino Jin'ya | ART | Nagano Prefecture |
| Takamatsu Castle | Eric | Kagawa Prefecture |
| Takamatsuyakushi Castle | ART | Nagano Prefecture |
| Takami Yakata | ART | Nagano Prefecture |
| Takamifuru Castle | ART | Nagano Prefecture |
| Takamuro Yashiki | ART | Yamanashi Prefecture |
| Takanashi Yakata | ART | Nagano Prefecture |
| Takanashi Yakata (Suzaka) | ART | Nagano Prefecture |
| Takane Castle | Eric | Shizuoka Prefecture |
| Takano Castle (Omi) | ART | Shiga Prefecture |
| Takano Yakata | ART | Shiga Prefecture |
| Takao Castle | ART | Ishikawa Prefecture |
| Takao Castle (Koka) | Eric | Shiga Prefecture |
| Takaoka Castle | ART | Toyama Prefecture |
| Takasaka Yakata | Eric | Saitama Prefecture |
| Takasaki Castle | Eric | Gunma Prefecture |
| Takashima Castle | Eric | Nagano Prefecture |
| Takashimako Castle | ART | Nagano Prefecture |
| Takasu Castle (Chikuma) | ART | Nagano Prefecture |
| Takasu Castle (Mino) | ART | Gifu Prefecture |
| Takatenjin Castle | Eric | Shizuoka Prefecture |
| Takato Castle | Eric | Nagano Prefecture |
| Takatome Castle | Eric | Gunma Prefecture |
| Takatori Castle | Eric | Nara Prefecture |
| Takatsuki Castle | | Osaka |
| Takatsuki Castle (Tokyo) | Eric | Tokyo |
| Takatsuya Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Takayama Castle (Chikuma) | ART | Nagano Prefecture |
| Takayama Castle (Hida) | ART | Gifu Prefecture |
| Takayama Castle (Hiroshima) | Eric | Hiroshima Prefecture |
| Takayama Castle (Mino) | ART | Gifu Prefecture |
| Takayama Jin'ya | Eric | Gifu Prefecture |
| Takayashikidate | Eric | Aomori Prefecture |
| Takeba Castle | ART | Nagano Prefecture |
| Takeda Castle | Eric | Hyogo Prefecture |
| Takeda Castle (Chikuma) | ART | Nagano Prefecture |
| Takeda Hyogosuke Yashiki | ART | Yamanashi Prefecture |
| Takeda Kingo Yashiki | ART | Yamanashi Prefecture |
| Takeda Motonobu Yakata | ART | Fukui Prefecture |
| Takeda Nobunari Yakata | ART | Yamanashi Prefecture |
| Takeda Nobushige Yakata | ART | Yamanashi Prefecture |
| Takeda Yakata (Ibaraki) | Eric | Ibaraki Prefecture |
| Takedashishugo Yakata | ART | Yamanashi Prefecture |
| Takegahana Castle | ART | Gifu Prefecture |
| Takei Castle | ART | Nagano Prefecture |
| Takei Castle (Suwa) | ART | Nagano Prefecture |
| Takekuma Castle (Hitachi) | ART | Ibaraki Prefecture |
| Takekurabe Castle | ART | Shiga Prefecture |
| Takemoto Castle (Mikawa) | ART | Aichi Prefecture |
| Takenaka Castle (Koka) | Eric | Shiga Prefecture |
| Takenaka Jinya | RaymondW | Gifu Prefecture |
| Takeno Castle | ART | Nagano Prefecture |
| Takenohana Yakata | ART | Yamanashi Prefecture |
| Takenoya Castle (Mikawa) | ART | Aichi Prefecture |
| Takenoya Jin'ya | ART | Aichi Prefecture |
| Takeshita Noritsune Yashiki | ART | Aichi Prefecture |
| Takeyama Castle (Hanishina) | ART | Nagano Prefecture |
| Taki Castle | Eric | Saitama Prefecture |
| Taki Castle (Mikawa) | ART | Aichi Prefecture |
| Takijiri Castle | ART | Fukushima Prefecture |
| Takinogawa Castle | Eric | Tokyo |
| Takinoiri Castle | ART | Nagano Prefecture |
| Takisawa Castle (Azumi) | ART | Nagano Prefecture |
| Takisawa Yakata | ART | Nagano Prefecture |
| Takiwaki Castle | ART | Aichi Prefecture |
| Takiwaki Jin'ya | ART | Aichi Prefecture |
| Takiyama Castle | Eric | Tokyo |
| Takiyama Castle (Mikawa) | ART | Aichi Prefecture |
| Takusagawa Yashiki | ART | Yamanashi Prefecture |
| Tama Castle (Mino) | ART | Gifu Prefecture |
| Tamagusuku Castle | RaymondW | Okinawa Prefecture |
| Tamaru Castle | RaymondW | Mie Prefecture |
| Tanabe Castle | RaymondW | Kyoto |
| Tanabe Castle (Kii) | Andrew A | Wakayama Prefecture |
| Tanagi Castle (Ina) | ART | Nagano Prefecture |
| Tanagura Castle | ART | Fukushima Prefecture |
| Tanaka Buzennokami Yashiki | ART | Yamanashi Prefecture |
| Tanaka Castle | Eric | Shizuoka Prefecture |
| Tanaka Castle (Ina) | ART | Nagano Prefecture |
| Tanaka Tadamasa Yashiki | ART | Yamanashi Prefecture |
| Tanaka Tajimanokami Yashiki | ART | Yamanashi Prefecture |
| Tanaka Yazouyaemon Yashiki | ART | Yamanashi Prefecture |
| Tanba Kameyama Castle | Eric | Kyoto |
| Tanba Yashiki (Suwa) | ART | Nagano Prefecture |
| Tanemura Castle (Omi) | ART | Shiga Prefecture |
| Tange Fort | Eric | Aichi Prefecture |
| Tanigadou Castle (Yamashiro) | ART | Kyoto |
| Tanno Castle | ART | Aichi Prefecture |
| Tanoiri Castle (Azumi) | ART | Nagano Prefecture |
| Tanokuchi Jin'ya | ART | Nagano Prefecture |
| Tarui Castle | ART | Gifu Prefecture |
| Tashiro Castle (Nukata) | ART | Aichi Prefecture |
| Tashiro Yashiki | ART | Aichi Prefecture |
| Tashirode Castle | ART | Aichi Prefecture |
| Tatai Castle | ART | Nagano Prefecture |
| Tatai Yakata | ART | Nagano Prefecture |
| Tataifuru Castle | ART | Nagano Prefecture |
| Tataijoumonomi Fort | ART | Nagano Prefecture |
| Tatebayashi Castle | Eric | Gunma Prefecture |
| Tateishi Fort | ART | Nagano Prefecture |
| Tatenouchi Yakata | ART | Nagano Prefecture |
| Tateyama Castle | Eric | Chiba Prefecture |
| Tateyama Castle (Yamagata) | Eric | Yamagata Prefecture |
| Tatsugoyama Castle | ART | Ibaraki Prefecture |
| Tatsuno Castle | Eric | Hyogo Prefecture |
| Tatsuoka Castle | Eric | Nagano Prefecture |
| Tawada Castle | ART | Shiga Prefecture |
| Taya Castle (Azumi) | ART | Nagano Prefecture |
| Tayasu Jin'ya | ART | Yamanashi Prefecture |
| Tazawa Castle (Chikuma) | ART | Nagano Prefecture |
| Tedori Castle | Eric | Wakayama Prefecture |
| Tekozuka Castle | ART | Nagano Prefecture |
| Tenjin'yama Castle | ART | Fukushima Prefecture |
| Tenjin'yama Castle (Musashi) | ART | Saitama Prefecture |
| Tenjin'yama Castle (Suwa) | ART | Nagano Prefecture |
| Tenjin'yama Jinsho (Mikawa) | ART | Aichi Prefecture |
| Tenjinyama Castle (Hiroshima) | Eric | Hiroshima Prefecture |
| Tenjinyama Castle (Tanba) | Eric | Kyoto |
| Tenpaku Castle | Eric | Nagano Prefecture |
| Tenpaku Castle (Ina) | ART | Nagano Prefecture |
| Teraba Fort (Ashigara Castle) | ART | Shizuoka Prefecture |
| Terabe Castle | ART | Aichi Prefecture |
| Terabe Castle (Hazu) | ART | Aichi Prefecture |
| Terakura Yakata | ART | Shiga Prefecture |
| Terao Castle (Hanishina) | ART | Nagano Prefecture |
| Terao Chausuyama Castle | Eric | Gunma Prefecture |
| Terao Naka Castle | Eric | Gunma Prefecture |
| Teshiro Castle | ART | Nagano Prefecture |
| Teshirozuka Castle (Saku) | ART | Nagano Prefecture |
| Teusuyama Fort | Eric | Gunma Prefecture |
| Tezuka Yakata | ART | Nagano Prefecture |
| Tezutsuyama Castle | ART | Fukui Prefecture |
| To-no-oka | Eric | Hiroshima Prefecture |
| Toba Castle | ART | Mie Prefecture |
| Toba Yakata | ART | Nagano Prefecture |
| Tobayama Castle | Eric | Shizuoka Prefecture |
| Tobigasuyama Fort | ART | Aichi Prefecture |
| Tobiyama Castle | Eric | Tochigi Prefecture |
| Tobuki Castle | ART | Tokyo |
| Tochigi Castle | ART | Tochigi Prefecture |
| Todoroki Castle | ART | Nagano Prefecture |
| Todoroki Yakata | ART | Nagano Prefecture |
| Todoroki Yashiki | ART | Nagano Prefecture |
| Togari Castle (Mikawa) | ART | Aichi Prefecture |
| Toishi Castle | Eric | Nagano Prefecture |
| Toishi Fukuzawa Fort | ART | Nagano Prefecture |
| Toishi Iizuna Castle | ART | Nagano Prefecture |
| Toishi Kikubatakeno Castle | ART | Nagano Prefecture |
| Tojo Castle | Furinkazan | Aichi Prefecture |
| Tokiwa Castle | ART | Fukushima Prefecture |
| Tokoji Castle | Eric | Miyagi Prefecture |
| Tokoname Castle | ART | Aichi Prefecture |
| Tokumi Jin'ya | ART | Yamanashi Prefecture |
| Tokura Castle | Eric | Tokyo |
| Tokushima Castle | RaymondW | Tokushima Prefecture |
| Tomioka Castle | Frank T. | Kumamoto Prefecture |
| Tomioka Castle (Kozuke) | ART | Gunma Prefecture |
| Tomioka Jin'ya | ART | Gunma Prefecture |
| Tomo Castle | Eric | Hiroshima Prefecture |
| Tomokyu Castle (Mikawa) | ART | Aichi Prefecture |
| Tonbori Castle (Tanba) | ART | Hyogo Prefecture |
| Tongari Yashiki | ART | Nagano Prefecture |
| Tonnaha Castle | RaymondW | Okinawa Prefecture |
| Tono Yakata | ART | Nagano Prefecture |
| Tonojima Castle | ART | Nagano Prefecture |
| Tonomi-no-saku | Eric | Iwate Prefecture |
| Tonomura Yakata (Azumi) | ART | Nagano Prefecture |
| Tonomura Yakata (Omi) | ART | Shiga Prefecture |
| Tonoyama Castle (Koka) | Eric | Shiga Prefecture |
| Tonoyama Fort | ART | Shiga Prefecture |
| Toride Fort | ART | Nagano Prefecture |
| Torigoe Castle | Furinkazan | Ishikawa Prefecture |
| Torihara Fort | ART | Yamanashi Prefecture |
| Torikoya Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Torinji Castle | Eric | Ibaraki Prefecture |
| Toro Castle (Mikawa) | ART | Aichi Prefecture |
| Toro Jin'ya (Mikawa) | ART | Aichi Prefecture |
| Tottori Castle | ART | Tottori Prefecture |
| Toube Castle (Mikawa) | ART | Aichi Prefecture |
| Touendou Castle (Omi) | ART | Shiga Prefecture |
| Tougeyama Noroshidai | ART | Nagano Prefecture |
| Toujou Fort | ART | Niigata Prefecture |
| Tounohara Castle | ART | Nagano Prefecture |
| Tounosu Castle (Mikawa) | ART | Aichi Prefecture |
| Touyagane Castle | ART | Aichi Prefecture |
| Toyama Castle | Frank T. | Toyama Prefecture |
| Toyo Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Toyoda Castle | ART | Ibaraki Prefecture |
| Toyoda Tachi | ART | Iwate Prefecture |
| Toyokawa Castle | ART | Aichi Prefecture |
| Toyooka Castle | Eric | Hyogo Prefecture |
| Toyooka Jinya | Eric | Hyogo Prefecture |
| Tsu Castle | Eric | Mie Prefecture |
| Tsubaki Castle | ART | Yamanashi Prefecture |
| Tsubaki Yashiki | ART | Aichi Prefecture |
| Tsubame Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Tsubokasayama Castle | Eric | Shiga Prefecture |
| Tsuchiura Castle | Eric | Ibaraki Prefecture |
| Tsuchiyama Castle (Koka) | Eric | Shiga Prefecture |
| Tsuda Castle (Omi) | ART | Shiga Prefecture |
| Tsuji Yashiki (Kai) | ART | Yamanashi Prefecture |
| Tsukanokoshikofun Fort | ART | Shiga Prefecture |
| Tsukie Fort | ART | Yamanashi Prefecture |
| Tsukikanekubo Fort | ART | Nagano Prefecture |
| Tsukikuma Castle | ART | Oita Prefecture |
| Tsukioi Castle | ART | Nagano Prefecture |
| Tsukiyama Yakata | ART | Yamaguchi Prefecture |
| Tsukiyodana Castle | ART | Nagano Prefecture |
| Tsukui Castle | Eric | Kanagawa Prefecture |
| Tsukurioka Castle (Mikawa) | ART | Aichi Prefecture |
| Tsumagi Castle | Eric | Gifu Prefecture |
| Tsumago Castle | EtienneJ | Nagano Prefecture |
| Tsumi Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Tsuneyama Castle | Phibbyfan | Okayama Prefecture |
| Tsuruga Castle | ART | Fukui Prefecture |
| Tsurugaoka Castle | ART | Yamagata Prefecture |
| Tsurugawa Yakata | ART | Yamanashi Prefecture |
| Tsutagi Castle | ART | Nagano Prefecture |
| Tsutsugahana Castle | ART | Nagano Prefecture |
| Tsutsuhata Castle I | ART | Nagano Prefecture |
| Tsutsuhata Castle II | ART | Nagano Prefecture |
| Tsutsuhata Castle III | ART | Nagano Prefecture |
| Tsutsuhata Castle IV | ART | Nagano Prefecture |
| Tsutsuhata Castle V | ART | Nagano Prefecture |
| Tsutsujigasaki Fort | ART | Yamanashi Prefecture |
| Tsutsujigasaki Palace | Eric | Yamanashi Prefecture |
| Tsutsumi Yashiki | ART | Yamanashi Prefecture |
| Tsutsumihonji Castle | ART | Aichi Prefecture |
| Tsuwano Castle | Eric | Shimane Prefecture |
| Tsuyama Castle | Eric | Okayama Prefecture |
| Tsuyama Castle (Koka) | Eric | Shiga Prefecture |
| Ubaguchi Fort | ART | Yamanashi Prefecture |
| Uchi Castle (Chikuma) | ART | Nagano Prefecture |
| Uchi Castle (Ina) | ART | Nagano Prefecture |
| Uchibori Yakata (Azumi) | ART | Nagano Prefecture |
| Uchida Yashiki (Totomi) | ART | Shizuoka Prefecture |
| Uchigoya Yakata | ART | Nagano Prefecture |
| Uchikoshi Castle (Koka) | Eric | Shiga Prefecture |
| Uda Matsuyama Castle | Eric | Nara Prefecture |
| Ue Castle (Koka) | Eric | Shiga Prefecture |
| Ueda Castle | Eric | Nagano Prefecture |
| Ueda Castle (Chikuma) | ART | Nagano Prefecture |
| Uede Yashiki | ART | Nagano Prefecture |
| Uegusuku Castle | RaymondW | Okinawa Prefecture |
| Uehara Castle | Eric | Nagano Prefecture |
| Ueji Castle (Mikawa) | ART | Aichi Prefecture |
| Ueno Castle (Ise) | ART | Mie Prefecture |
| Ueno Castle (Kai) | ART | Yamanashi Prefecture |
| Ueno Castle (Koka) | Eric | Shiga Prefecture |
| Ueno Castle (Kozuke) | ART | Gunma Prefecture |
| Ueno Castle (Mikawa) | ART | Aichi Prefecture |
| Ueno Yashiki | ART | Yamanashi Prefecture |
| Uenodan Castle (Kiso) | ART | Nagano Prefecture |
| Uenodan Yakata | ART | Nagano Prefecture |
| Uenohara Castle | ART | Yamanashi Prefecture |
| Uenotaira Castle | ART | Nagano Prefecture |
| Uenoyama Castle | ART | Nagano Prefecture |
| Uenoyama Castle (Chikuma) | ART | Nagano Prefecture |
| Uenoyama Castle (Sagami) | ART | Kanagawa Prefecture |
| Ueshi Castle | Phibbyfan | Tottori Prefecture |
| Uesugi Yakata | ART | Niigata Prefecture |
| Uewada Fort | ART | Aichi Prefecture |
| Ukigai Castle | ART | Aichi Prefecture |
| Umenoki Yashiki | ART | Yamanashi Prefecture |
| Umiteura Battery (Obama Domain) | ART | Fukui Prefecture |
| Unagizuka Castle (Mikawa) | ART | Aichi Prefecture |
| Uneme Castle | ART | Mie Prefecture |
| Unuma Castle | 豪谷 | Gifu Prefecture |
| Urabe Castle (Mikawa) | ART | Aichi Prefecture |
| Urado Castle | RaymondW | Kochi Prefecture |
| Urasoe Castle | RaymondW | Okinawa Prefecture |
| Urizura Castle | ART | Ibaraki Prefecture |
| Usayama Castle | Eric | Shiga Prefecture |
| Ushibuse Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Ushigahana Fort | ART | Gifu Prefecture |
| Ushigome Castle | Eric | Tokyo |
| Ushiku Castle | Eric | Ibaraki Prefecture |
| Ushiku Jinya | Eric | Ibaraki Prefecture |
| Ushitate Yakata | ART | Nagano Prefecture |
| Usui Castle | Eric | Chiba Prefecture |
| Usuida Shukuuchi Fort | Eric | Chiba Prefecture |
| Usuki Castle | Frank T. | Oita Prefecture |
| Utasu Castle (Kaga) | ART | Ishikawa Prefecture |
| Utsunomiya Castle | Eric | Tochigi Prefecture |
| Utsuro Yakata | ART | Shiga Prefecture |
| Utsutsu Castle | ART | Nagano Prefecture |
| Utsuyama Castle | ART | Shizuoka Prefecture |
| Uwajima Castle | | Ehime Prefecture |
| Uyama Castle (Azumi) | ART | Nagano Prefecture |
| Uyama Yakata (Azumi) | ART | Nagano Prefecture |
| Uzuhashi Castle (Azumi) | ART | Nagano Prefecture |
| Wada Castle (Chikuma) | ART | Nagano Prefecture |
| Wada Castle (Ina) | ART | Nagano Prefecture |
| Wada Castle (Koka) | Eric | Shiga Prefecture |
| Wada Yakata (Kanzaki) | ART | Shiga Prefecture |
| Wadahigashiyama Castle | ART | Nagano Prefecture |
| Wadashi Castle I (Koka) | Eric | Shiga Prefecture |
| Wadashi Castle II (Koka) | Eric | Shiga Prefecture |
| Wadashi Castle III (Koka) | Eric | Shiga Prefecture |
| Wadayama Castle (Omi) | ART | Shiga Prefecture |
| Wadayamako Castle (Omi) | ART | Shiga Prefecture |
| Wagou Castle (Murakami Clan Fort Network) | ART | Nagano Prefecture |
| Wakabayashi Yashiki | ART | Aichi Prefecture |
| Wakaguriyama Fort | ART | Nagano Prefecture |
| Wakamatsu Castle (Azumi) | ART | Nagano Prefecture |
| Wakamiko Castle | ART | Yamanashi Prefecture |
| Wakamiya Iriyama Castle | ART | Nagano Prefecture |
| Wakaowade Yashiki | ART | Yamanashi Prefecture |
| Wakasa Takeda Yakata | ART | Fukui Prefecture |
| Wakatsukisato Castle | ART | Nagano Prefecture |
| Wakatsukiyama Bandoko Castle | ART | Nagano Prefecture |
| Wakatsukiyama Castle | ART | Nagano Prefecture |
| Wakayama Castle | Eric | Wakayama Prefecture |
| Wakimoto Castle | Eric | Akita Prefecture |
| Warabi Castle (Kozuke) | ART | Gunma Prefecture |
| Washi Castle | Eric | Tochigi Prefecture |
| Washio Castle | Eric | Nagano Prefecture |
| Washizu Fort | Eric | Aichi Prefecture |
| Watanabe Yashiki (Kai) | ART | Yamanashi Prefecture |
| Watanabe Yashiki (Mikawa) | ART | Aichi Prefecture |
| Watanabeshifuru Yashiki | ART | Aichi Prefecture |
| Watari Castle (Mikawa) | ART | Aichi Prefecture |
| Watauchi Inoue Yakata | ART | Nagano Prefecture |
| Yabarahigashimura Yashiki | ART | Nagano Prefecture |
| Yabe Oribe Yashiki | ART | Aichi Prefecture |
| Yabuhara Fort | ART | Nagano Prefecture |
| Yabutsude Castle (Omi) | ART | Shiga Prefecture |
| Yaga Castle (Tanba) | ART | Kyoto |
| Yagi Castle | Eric | Hyogo Prefecture |
| Yagi Castle (Tanba) | Eric | Kyoto |
| Yaguchi Yakata | ART | Nagano Prefecture |
| Yagura Castle (Chikuma) | ART | Nagano Prefecture |
| Yagura Castle (Kii) | ART | Wakayama Prefecture |
| Yagura Castle (Sanada) | ART | Nagano Prefecture |
| Yahatayama Fort | ART | Gunma Prefecture |
| Yakami Castle | Eric | Hyogo Prefecture |
| Yakushidou Castle (Ina) | ART | Nagano Prefecture |
| Yakyu Fort | ART | Nagano Prefecture |
| Yamabe Castle | Eric | Nagano Prefecture |
| Yamabe Yakata | ART | Nagano Prefecture |
| Yamabukiko Castle | ART | Nagano Prefecture |
| Yamabukioh Castle | ART | Nagano Prefecture |
| Yamabukiyama Noroshidai | ART | Nagano Prefecture |
| Yamada Castle | Eric | Saitama Prefecture |
| Yamada Shigetada Yakata | ART | Aichi Prefecture |
| Yamada Takanashi Yakata | ART | Nagano Prefecture |
| Yamada Yakata (Sarashina) | ART | Nagano Prefecture |
| Yamada Yakata (Takai) | ART | Nagano Prefecture |
| Yamadaohshimo Yakata | ART | Nagano Prefecture |
| Yamadera Yashiki | ART | Yamanashi Prefecture |
| Yamaga Jin'ya | Eric | Kyoto |
| Yamaga Yakata | ART | Nagano Prefecture |
| Yamagami Castle | Eric | Gunma Prefecture |
| Yamagata Castle | Eric | Yamagata Prefecture |
| Yamagata Castle (Hitachi) | ART | Ibaraki Prefecture |
| Yamaguchi Castle | ART | Yamaguchi Prefecture |
| Yamaguchi Yashiki | ART | Nagano Prefecture |
| Yamaji Castle (Omi) | ART | Shiga Prefecture |
| Yamakami Jin'ya | ART | Shiga Prefecture |
| Yamamoto Jin'ya | ART | Shizuoka Prefecture |
| Yamana Castle | Eric | Gunma Prefecture |
| Yamanaka Castle | Eric | Shizuoka Prefecture |
| Yamanaka Castle (Mikawa) | 豪谷 | Aichi Prefecture |
| Yamanaka Castle (Mino) | ART | Gifu Prefecture |
| Yamanaka Yakata (Kai) | ART | Yamanashi Prefecture |
| Yamanaka Yashiki (Koka) | Eric | Shiga Prefecture |
| Yamashina Honganji | Eric | Kyoto |
| Yamataka Yashiki (Kai) | ART | Yamanashi Prefecture |
| Yamato Koriyama Castle | RaymondW | Nara Prefecture |
| Yamazaki Castle | ART | Kyoto |
| Yamazaki Castle (Saitama) | Eric | Saitama Prefecture |
| Yamazaki Fort (Chikuma) | ART | Nagano Prefecture |
| Yamazaki Fort (Odani Castle) | ART | Shiga Prefecture |
| Yamazoe Date | ART | Yamagata Prefecture |
| Yamori Castle (Omi) | ART | Shiga Prefecture |
| Yamura Castle | Eric | Yamanashi Prefecture |
| Yamura Jin'ya | Eric | Yamanashi Prefecture |
| Yanagawa Castle | ART | Fukushima Prefecture |
| Yanagizakaue Fort | ART | Nagano Prefecture |
| Yashima Castle | ART | Kagawa Prefecture |
| Yashima Castle (Chiisagata) | ART | Nagano Prefecture |
| Yashimashi Yashiki | ART | Nagano Prefecture |
| Yashiro Castle | ART | Nagano Prefecture |
| Yashiro Yakata | ART | Nagano Prefecture |
| Yashiro Yashiki (Kai) | ART | Yamanashi Prefecture |
| Yashirofuru Castle | ART | Nagano Prefecture |
| Yasuda Castle | Furinkazan | Toyama Prefecture |
| Yasuda Castle (Echigo) | ART | Niigata Prefecture |
| Yasuda Yoshisada Yakata | ART | Yamanashi Prefecture |
| Yasuoka Castle (Ina) | ART | Nagano Prefecture |
| Yato Castle | Eric | Yamanashi Prefecture |
| Yatsushiro Castle | Frank T. | Kumamoto Prefecture |
| Yatsushiro Yashiki | ART | Yamanashi Prefecture |
| Yawatamura Castle (Mikawa) | ART | Aichi Prefecture |
| Yazako Higashi Castle | ART | Aichi Prefecture |
| Yazako Nishi Castle | ART | Aichi Prefecture |
| Yazawa Castle (Sanada) | ART | Nagano Prefecture |
| Yazawashi Castle (Sanada) | ART | Nagano Prefecture |
| Yoda Yakata | ART | Nagano Prefecture |
| Yodo Castle | | Kyoto |
| Yogaisan Castle | Eric | Yamanashi Prefecture |
| Yoita Jin'ya | ART | Niigata Prefecture |
| Yokkaichi Jin'ya | ART | Mie Prefecture |
| Yokochi Castle | ART | Shizuoka Prefecture |
| Yokokawa Castle (Ina) | ART | Nagano Prefecture |
| Yokose Yakata | ART | Nagano Prefecture |
| Yokosearagamiyama Castle | ART | Nagano Prefecture |
| Yokosuka Castle | Eric | Shizuoka Prefecture |
| Yokota Castle | ART | Nagano Prefecture |
| Yokote Castle | | Akita Prefecture |
| Yokoyairi Fort | ART | Nagano Prefecture |
| Yokoyama Castle | ART | Nagano Prefecture |
| Yokoyama Castle (Chikuma) | ART | Nagano Prefecture |
| Yokoyama Castle (Ina) | ART | Nagano Prefecture |
| Yomogidaira Castle (Minochi) | ART | Nagano Prefecture |
| Yonago Castle | Eric | Tottori Prefecture |
| Yonako Castle (Shinano) | ART | Nagano Prefecture |
| Yonefukuchousha Yashiki | ART | Aichi Prefecture |
| Yonezawa Castle | | Yamagata Prefecture |
| Yorii Castle (Hitachi) | ART | Ibaraki Prefecture |
| Yoritomoyama Fort | ART | Nagano Prefecture |
| Yoshida Castle | Eric | Aichi Prefecture |
| Yoshida Castle (Hitachi) | ART | Ibaraki Prefecture |
| Yoshiike Awaji Yashiki | ART | Nagano Prefecture |
| Yoshimizu Jinya | Eric | Tochigi Prefecture |
| Yoshinogari | AllenK | Saga Prefecture |
| Yoshinohori Yashiki | ART | Nagano Prefecture |
| Yoshinomachi Yakata | ART | Nagano Prefecture |
| Yoshioka Castle (Ina) | ART | Nagano Prefecture |
| Yuhigaoka Castle | Eric | Shiga Prefecture |
| Yuminoshou Castle | ART | Toyama Prefecture |
| Yumurayama Castle | Eric | Yamanashi Prefecture |
| Yunagaya Jin'ya | ART | Fukushima Prefecture |
| Yuzawa Castle | ART | Akita Prefecture |
| Yuzuki Castle | | Ehime Prefecture |
| Zaike Castle (Mikawa) | ART | Aichi Prefecture |
| Zakimi Castle | | Okinawa Prefecture |
| Zaoudou Castle | ART | Niigata Prefecture |
| Zen Castle | Eric | Gunma Prefecture |
| Zenkaizu Castle | ART | Nagano Prefecture |
| Zenrinji Castle | ART | Mie Prefecture |
| Zenshoji Fort | Eric | Aichi Prefecture |
| Zeze Castle | RaymondW | Shiga Prefecture |
| Zuirenji Yakata | ART | Yamanashi Prefecture |
