Sobieski 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 2020 census, its population was 275, up from 259 at the 2010 census. 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.