The Sibley Lake National Wildlife Refuge is located in the U.S. state of North Dakota and consists of 1,077 acres (4.35 km<sup>2</sup>). Sibley Lake is a privately owned easement refuge, managed with by the U.S. Fish and Wildlife Service. The refuge was established to protect habitat for migratory bird species, white-tail deer, and other mammals. The refuge contains a 525-acre (2.12 km<sup>2</sup>) fresh water marsh that provides excellent migratory bird habitat. Valley City Wetland Management District oversees the refuge, which in turn is a part of the Arrowwood National Wildlife Refuge Complex.