洲本市是淡路岛中部，与淡路市、南淡路市接壤的一市。2006年2月11日，旧洲本市（人口38,926人）与津名郡五色町（人口11,100人）新设合并为“新”洲本市（人口50,026人、18,684户）。

Sumoto(洲本市,Sumoto-shi) is a city located on Awaji Island, Hyōgo Prefecture, Japan. The city was founded on February 11, 1940. As of March 31, 2008, the city has an estimated population of 50,087 and a population density of 267 persons per km². The total area is 182.47 km². On February 11, 2006, the town of Goshiki (from Tsuna District) was merged into Sumoto. Sumoto City is famous for Awaji onions, Naruto oranges and Kobe Beef.