Thornhill Hall is a ruined medieval manor house on a moated island in Rectory Park, Thornhill, West Yorkshire, England. The ruins are listed as grade II.[1] and the moat, with the surrounding grounds, is a scheduled monument.[2]
Excavations carried out between 1964 and 1972 proved that there had been two halls on the island, an earlier 13th-century building with clay-bonded foundation walls, and a later c. 1450 stone H-plan building. The later building showed signs of renovation in the 16th century, when a paved floor, plaster walls and a chimney were added.