The Park Avenue Armory, also known as the 7th Regiment Armory, is a historic armory for the U.S. Army National Guard at 643 Park Avenue in the Upper East Side neighborhood of Manhattan in New York City, United States. Designed in the Gothic Revival style by Charles Clinton for the 7th New York Militia Regiment, the Park Avenue Armory was completed in 1880, with two expansions in the early 20th century. The building and its interior are New York City designated landmarks, and the structure was made a National Historic Landmark in 1986. Since 2006, it has been the home of the Park Avenue Armory Conservancy, which leased the building for 99 years from the New York state government. The 53rd Digital Liaison Detachment of the New York Army National Guard, the Veterans of the 7th Regiment, the Knickerbocker Greys cadet corps, and the Lenox Hill Neighborhood House also occupy parts of the armory.

The Upper East Side, sometimes abbreviated UES, is a neighborhood in the borough of Manhattan in New York City, bounded approximately by 96th Street to the north, the East River to the east, 59th Street to the south, and Central Park and Fifth Avenue to the west. The area incorporates several smaller neighborhoods, including Lenox Hill, Carnegie Hill, and Yorkville. Once known as the Silk Stocking District, it has long been the most affluent neighborhood in New York City.