Petworth House in the parish of Petworth, West Sussex, England, is a late 17th-century Grade I listed country house, rebuilt 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 (d.1721). It is the manor house of the manor of Petworth. For centuries it was the southern home for the Percy family, Earls of Northumberland.

Petworth is famous for its extensive art collection made by the Northumberland and Seymour/Somerset families and George Wyndham, 3rd Earl of Egremont (1751-1837), containing many works by his friend J. M. W. Turner. It also has an expansive deer park, landscaped by Capability Brown, which contains a large herd of fallow deer.

The manor of Petworth first came into the possession of the Percy family as a royal gift from Adeliza of Louvain, the widow of King Henry I (1100-1135), to her brother Joscelin of Louvain. He later married the Percy heiress and adopted the surname Percy. His descendants became the Earls of Northumberland, the most powerful family in northern England. The Percy family, whose primary seat was at Alnwick Castle in Northumberland, bordering Scotland, intended Petworth to be for their occasional residence only.

The site was previously occupied by a fortified manor house built by Henry de Percy, 1st Baron Percy (1273–1314) in 1308–9, the chapel and undercroft of which still survive as part of the current house.

The house and deer park were handed over to the nation in 1947 by Edward Wyndham, 5th Baron Leconfield (1883-1967) and are now managed by the National Trust under the name Petworth House & Park. The Leconfield Estates would continue to own much of Petworth and the surrounding area and the family would be able to continue living in part of Petworth House.

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