Maple Lawn, also known as the Walter Vail House, is a residence in Balmville, New York, United States built in the Gothic Revival architectural style's Picturesque mode. It was designed by Frederick Clarke Withers, following principles of his late mentor, Andrew Jackson Downing, and commissioned by a wealthy local family in 1859. Since then it has undergone very few revisions, making it a well-preserved exemplar of the style, Withers' houses and Downing's aesthetics. It was added to the National Register of Historic Places in 1984.