Erddig (Welsh pronunciation: [ˈɛrðɪɡ]) is a country house and estate in the community of Marchwiel, approximately 2 miles (3.2 km) south of Wrexham, Wales.

It is centred on a country house which dates principally from between 1684 and 1687, when the central block was built by Joshua Edisbury, and the 1720s, when the flanking wings were added by its second owner, John Meller.

[5][6] The estate is approximately 1,900 acres (770 ha) in size, and includes part of Wat's Dyke and the remains of a motte-and-bailed castle of the Norman period.

[7][8] A pair of gates, originally located at Stansty Park and attributed to Robert Davies, stand at the end of the garden canal.

[9] A section of Wat's Dyke approximately 1,500 metres (4,900 ft) long runs north to south through the park, to the west of the house.

[10] Part of Wat's Dyke is incorporated into a Norman motte-and-bailey castle, called "Wristleham" in a pipe roll dated to 1161, which is located within the park on a bluff above the confluence of the Black Brook and River Clywedog.

The castle was probably established soon after the Norman Conquest, but became redundant as the border between England and Gwynedd moved westward toward Ruthin and Denbigh.

[11] The original house was built on the escarpment above the Clywedog between 1684 and 1689 to the designs of Thomas Webb for Joshua Edisbury of Pentre Clawdd, High Sheriff of Denbighshire.

The house began to decay under his successor, Simon Yorke IV, who became reclusive and failed to install electricity, running water, gas or a phone.

[17] A tour of the house, which starts "below stairs", tells of the Yorke family's unusually high regard for their servants and, through a collection of portraits, photographs and verses (a family tradition started by Simon's son Philip Yorke (1743–1804), provides a record of the people who lived and worked on the estate.

He is quoted as saying: "My only interest for many years has been that this unique establishment for which my family have foregone many luxuries and comforts over seven generations should now be dedicated to the enjoyment of all those who may come here and see a part of our national heritage preserved for all foreseeable time."

Whilst occupied by the Yorke family the house was never installed with mains electricity, with the last Squire, Philip, relying on a portable generator to power his single television set.