Foster's Castle is a historic plantation house located near Tunstall, New Kent County, Virginia. It was built about 1685, as a 1 1/2-story, T-shaped brick building, with a two-story central projection at the front. The house is similar to neighboring Criss Cross. It was raised to a full two stories with a low pitched roof in 1873. Its builder, Colonel Joseph Foster, was a vestryman and supervisor of construction at St. Peter's Church.It was listed on the National Register of Historic Places in 1973.