Sumoto Castle was a Muromachi to Sengoku period Japanese castle located in the Orodani neighborhood of the city of Sumoto, Hyōgo Prefecture, Japan. Its ruins have been protected as a National Historic Site since 1999. It was also referred to as Mikuma Castle (三熊城).

Sumoto is a city located on Awaji Island, Hyōgo Prefecture, Japan. As of 1 June 2022, the city had an estimated population of 42,094 and a population density of 230 persons per km². The total area of the city is 182.38 square kilometres (70.42 sq mi).