William Smith House, also known as Jonas Smith House and Boidock House, is a historic home located at Hamilton, Loudoun County, Virginia. It was built about 1813–1820, and is a two-story, three-bay, Federal-style brick dwelling. It has a recessed right-side dining and kitchen wing, also in brick, originally 1+1⁄2 stories, now two stories. Also on the property are the contributing brick barn with diamond-patterned ventilation holes, two-story springhouse, a wide loafing shed, a large corncrib, and two-car garage.