Roseau is a city in Roseau County, Minnesota, USA. The population was 2,633 at the 2010 census. It is the county seat of Roseau County.
Roseau has a strong high school hockey tradition and has competed in and won the Minnesota state hockey tournament more than any other team in the state (most recently in 2007). Roseau is also the home of Polaris Industries Inc.
According to the United States Census Bureau, the city has a total area of 2.4 square miles (6.2 km²).