Sumoto Castle (洲本城 Sumoto-jō?) is a castle with reconstructed keep in Sumoto on Awaji Island, Hyōgo Prefecture, Japan. The area is an Historic Site.
Fortification began in 1525, with remodelling in stone in the 1580s. The castle was abolished in the 1630s. In 1928 the keep was rebuilt in reinforced concrete.
Coordinates: 34°20′16″N 134°54′10″E / 34.33778°N 134.90278°E