S
- Saga Castle, Saga, Saga
- Sagiyama Castle, Gifu, Gifu Prefecture
- Saiki Castle, Saiki, Ōita
- Sakura Castle, Sakura, Chiba
- Sakurabora Castle, Gero, Gifu
- Sano Castle, Sano, Tochigi
- Sarukake Castle, Akitakata, Hiroshima
- Sarukake Castle, Kurashiki, Okayama
- Sasayama Castle, Sasayama, Hyōgo
- Satowara Castle, Miyazaki, Miyazaki
- Sawayama Castle, Hikone, Shiga
- Sekiyado Castle, Noda, Chiba
- Senshu Castle, Senshu, Osaka
- Shakujii castle, Nerima, Tokyo
- Shibata Castle, Shibata, Niigata
- Shichinohe Castle, Kamikita District, Aomori
- Shikizan Castle
- Shimabara Castle, Shimabara, Nagasaki
- Shimo-Akasaka Castle, Senshu, Osaka
- Shimotsui Castle, Kurashiki, Okayama
- Shinpu Castle, Nirasaki, Yamanashi
- Shirakawa Castle, Shirakawa, Fukushima
- Shiroishi Castle, Shiroishi, Miyagi
- Shizugatake Castle, Shizugatake, Omi
- Shoryuji Castle, Nagaokakyō, Kyoto
- Shuri Castle, Naha, Okinawa
- Sumoto Castle, Sumoto, Hyōgo
- Sunomata Castle, Ōgaki, Gifu
- Sunpu Castle, Shizuoka, Shizuoka
Read more about this topic: List Of Castles In Japan