The Roseau River is a 214 mi tributary of the Red River of the North, in southern Manitoba in Canada and northwestern Minnesota in the United States. Via the Red River, Lake Winnipeg and the Nelson River, it is part of the watershed of Hudson Bay. The name is from the French for reed, roseau, in turn from the Ojibwe Ga-shashagunushkokawi-sibi, "place-of-rushes river." The river flows through the Roseau River Anishinabe First Nation. It is also the namesake for the community of Roseau River in Manitoba.