Arundel Castle is a restored and remodelled medieval castle in Arundel, West Sussex, England. It was established by Roger de Montgomery on Christmas Day 1067. Roger became the first to hold the earldom of Arundel by the graces of William the Conqueror. The castle was damaged in the English Civil War and then restored in the 18th and 19th centuries by Charles Howard the 11th Duke of Norfolk.
From the 11th century, the castle has been the seat of the Earl of Arundel and, for over 400 years, the Duke of Norfolk. It is a Grade I listed building.