Wonastow Court, in Wonastow, Monmouthshire, Wales, is a 19th-century country house with earlier origins and later additions. The court is a Grade II listed building, and its gardens are listed, also at Grade II, on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.

The origins of the court are a 16th-century manor house, subsequently reduced and rebuilt.^[1] The existing central block was built for Thomas Swinnerton in 1803.^[2] Newman describes the court as "classical in style, of three storeys and five bays with (a) Doric porch.^[2] To the right of the central block is a gatehouse in a "Tudor style"^[2] of the later 19th century, whilst to the left is the original 17th-century house of the Milbournes.^[2] At one time the mansion had its own chapel but that had been converted into offices by the 20th century.^[3] The court is a Grade II listed building as of 5 January 1952.^[4] Its gardens are listed, also at Grade II, on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.^[5]

It was owned by Sir Lionel Milborne-Swinnerton-Pilkington bt. in 1901 although the person living there was Sir John Henry Seale, who was a baronet, Deputy Lieutenant and a Justice of the Peace.^[3]