Hardenburgh is a town located in the western part of Ulster County, New York, United States. The population was 221 at the 2020 census. The town is located inside the Catskill Park.

The Catskill Park is in the Catskill Mountains in the U.S. state of New York. It consists of 700,000 acres of land inside a Blue Line in four counties: Delaware, Greene, Sullivan, and Ulster. As of 2005, 287,500 acres (116,300 ha) or 41 percent of the land within, is owned by the state as part of the Forest Preserve; it is managed by the Department of Environmental Conservation (DEC). Another 5% is owned by New York City to protect four of the city's reservoirs in the region that lie partially within the park and their respective watersheds.