Nantucket Historic District

The Nantucket Historic District is a National Historic Landmark District that encompasses the entire island of Nantucket, Massachusetts. The original December 13, 1966 listing on the National Register of Historic Places included only the historic downtown core and the village of Siasconset, but was expanded in 1975 to include the entire island, as well as the islands of Tuckernuck and Muskeget. At over 30,000 acres, it is the largest conventional historic National Historic Landmark District by area in the contiguous United States.

Much of the district was originally designated as a local historic district in 1955, making it one of the earliest historic districts in the United States, along with the Charleston Historic District in Charleston, South Carolina, and the Vieux Carre Historic District in New Orleans. Since 1955, the Nantucket Historic District Commission has been the governing authority charged with overseeing the island's preservation.