Castle Hill (Virginia) is an historic, privately owned, 600-acre (243 ha) plantation located at the foot of the Southwest Mountains in Albemarle County, Virginia, near Monticello and the city of Charlottesville, and is recognized by the Virginia Landmarks Register and the National Register of Historic Places. Castle Hill was the beloved home of Dr. Thomas Walker (1715–1794) and his wife, Mildred Thornton Meriwether (widow of Nicholas Meriwether III). Walker was a close friend and the physician of Peter Jefferson, and later the guardian of young Thomas Jefferson after his father's death.