Smithills Hall is a Grade I listed manor house, and a scheduled monument in Halliwell, Greater Manchester, England. it stands on the slopes of the moors above Bolton at a height of 500 feet, two miles north west of the town centre. It occupies a defensive site near the Astley and Raveden Brooks. One of the oldest manor houses in the north west of England, its oldest parts, including the great hall, date from the 15th century and it has been since been altered and extended particularly the west part. Parts of it were moated. The property is owned by Bolton Metropolitan Borough Council and open to the public.