Vanderbilt Mansion National Historic Site is a historic house museum in Hyde Park, New York, United States. It became a National Historic Landmark in 1940. It is owned and operated by the National Park Service.

From the late 1870s to the 1920s, the Vanderbilt family employed some of the best Beaux-Arts architects and decorators in the United States to build an unequaled string of townhouses in New York City and palaces on the East Coast of the United States. Many of the Vanderbilt houses are now National Historic Landmarks. Some photographs of Vanderbilt residences in New York are included in the Photographic series of American Architecture by Albert Levy (1870s).