The Leiter House was a mansion that once stood at 1500 New Hampshire Avenue NW in the Dupont Circle neighborhood of Washington, D.C. Completed in 1893 for wealthy businessman Levi Leiter, the palatial 55-room neoclassical residence was designed by architect Theophilus P. Chandler Jr., whose notable works include Trinity Episcopal Church, the Stirling mansion, St. Thomas Episcopal Church, and the North Philadelphia station. The house was one of several mansions that were built in the late 19th and early 20th centuries around the perimeter of Dupont Circle, a traffic circle and park that was considered a fashionable area at the time.