Petworth House is a late 17th-century Grade I listed country house in the parish of Petworth, West Sussex, England. It was built in 1688 by Charles Seymour, 6th Duke of Somerset, and altered in the 1870s to the design of the architect Anthony Salvin. It contains intricate wood-carvings by Grinling Gibbons. It is the manor house of the manor of Petworth. For centuries it was the southern home for the Percy family, earls of Northumberland.