Gratiot may refer to: Places Gratiot, Ohio, a village Gratiot (town), Wisconsin, a town Gratiot, Wisconsin, a village Gratiot County, Michigan Gratiot Community Airport Gratiot River, Michigan Lake Gratiot, Michigan Other uses Gratiot (surname) M-3 (Michigan highway), known for most of its length as Gratiot Avenue See also Fort Gratiot Township, Michigan Fort Gratiot Light, a lighthouse in Michigan Dunkirk Light, also known as Point Gratiot Light, a lighthouse on Lake Erie in New York State Gratiot Street Prison, an American Civil War prison in St. Louis, Missouri Gratiot's Grove (Wisconsin), a frontier mining settlement and fort Gratiot House, a house in Wisconsin