Stoney Brook Township is a township in Saint Louis County, Minnesota, United States. The population was 332 at the 2010 census. U.S. Highway 2 and Saint Louis County Road 31 (CR 31) are two of the main routes in the township. County Road 31 runs north–south through the township. U.S. Highway 2 runs east–west along Stoney Brook Township's northern boundary line with adjacent Culver Township. A majority of Stoney Brook Township is located within the Fond du Lac Indian Reservation.