Wynnstay is a country house located in an important landscaped park 1.3 km (0.75 miles) south-east of Ruabon, near Wrexham, Wales. Wynnstay, previously Watstay, was a famous estate and the family seat of the Wynns.
During the 17th century, Sir John Wynn, 5th Baronet inherited the Watstay Estate through his marriage to Jane Evans (daughter of Eyton Evans of Watstay), and renamed it the Wynnstay Estate. The gardens were laid out by Capability Brown. Wynnstay was Brown's largest commission in Wales, with work beginning in 1774 and completed in 1784, a year after his death. He replaced the older formal gardens with lawns which swept right up to the house overlooking the lake.
In 1858 Wynnstay was destroyed by fire and was rebuilt on the same site.
After the house was vacated by the Williams-Wynn family in the mid-20th century, in favour of the nearby Plas Belan on the Wynnstay estate, it was bought by Lindisfarne College. When the school closed due to bankruptcy, the building was converted to flats and several private houses.
- "Capability Brown Festival - Wynnstay". 2016.
- Latham, Laura (14 April 2016). "Capability Brown, the Master of the English Garden". The New York Times.
- Hughes, Owen (3 February 2017). "'Live like a lord' in former mansion house of one of Wales's most powerful families". northwales.
- Transcript of information from Picturesque Views of Seats of The Noblemen and Gentlemen of Great Britain and Ireland edited by F. O. Morris (published c.1880) 
- 1860 – Wynnstay Hall, Ruabon, Wales