Harrisville State Park is a public recreation area covering 107 acres on the shore of Lake Huron off U.S. Route 23 in Harrisville and Harrisville Township, Alcona County, Michigan. The state park contains more than 100 acres of heavily forested land as well as a mile-long sandy beach. It is considered an important location for birders, with large and varied migratory populations of warblers and other song birds. The park is administered by the Michigan Department of Natural Resources.