THORNHILL, a village of England, in the West Riding of Yorkshire, on the Calder, 31 miles S.W. of York. It has an old parish church in the early English style, Wesleyan and Baptist chapels, two schools, and manufactures of woollen cloth, hardware, glass, chemical substances, &c. Not far off stand the ruins of an old castle, demolished by the Roundheads in the civil war. Pop. of the parish, 6858.