The William Sidney Mount House is a wood sided and wood shingled house built in 1725 located in Stony Brook on Long Island, New York. The American genre painter William Sidney Mount, 1807–1868, lived there and had his studio in the 3rd floor attic, which benefited from unusual skylights through the roof. The house became a National Historic Landmark in 1965.It is located at State Route 25A and Stony Brook Road, in Stony Brook, although the National Register of Historic Places incorrectly lists the location as being on New York State Route 25 and Gould Road, which is in Centereach, New York.
