Sobieski, Wisconsin is an unincorporated census-designated place in Oconto County in northeastern Wisconsin, United States. It is located within the Town of Little Suamico. As of the 2010 census, its population was 259. It is part of the Green Bay Metropolitan Statistical Area. The Little Suamico Town Hall is located in Sobieski, just east of the Escanaba and Lake Superior Railroad. Sobieski is located along County Trunk Highway S and Cross Road.