Lake Township is a township in Roseau County, Minnesota, United States. The population was 2,087 at the 2000 census. This township was originally called Algoma Township, which bears a name of Indian derivation, "formed by Schoolcraft from Algonquin and goma meaning 'Algonquin waters.' It designates a large district in Canada, bordering Lakes Huron and Superior. The name was changed sometime between 1954 and 1965.