Llwynywermod (Welsh: Llwynywermwd), also known as Llwynywormwood, is an estate owned by the Duchy of Cornwall, just outside the Brecon Beacons National Park in Carmarthenshire, Wales. The 192-acre (0.78 km2) estate is near the village of Myddfai, Llandovery, Carmarthenshire. The nearest station is Llandovery which is at the distance of 3.21 km (1.99 mi) from the estate.
William Williams, a relative of Anne Boleyn, was the owner in the 13th or 14th Centuries. In 1815, George Griffies-Williams was created a baronet, and Llwynywermod became the seat of the Griffies-Williams baronets, a line which came to an end in 1877.
In November 2006, Llwynywermod was purchased by the Duchy of Cornwall as a residence for the Duke in Wales. The Duchy completed its purchase of the property in April 2007. Prince Charles, who is also the Duke of Cornwall, and Camilla, Duchess of Cornwall, took up residence at the property in summer 2008.
The three-bedroom farmhouse was converted into a residence for Charles, Prince of Wales, by Craig Hamilton Architects using traditional building techniques. It was once the coach house to the now ruined 13-bedroom country house of the Griffies-Williams family that stood nearby. The courtyard range adjoining the main house is let as holiday accommodation when the Prince is not in residence.
- Highgrove House, near Tetbury, Gloucestershire, the family residence of the Prince of Wales and the Duchess of Cornwall
- Clarence House, in St James's, London, the official residence of the Prince of Wales and the Duchess of Cornwall
- Birkhall, a house in Aberdeenshire, Scotland, inherited by Prince Charles from Queen Elizabeth The Queen Mother
- Baker, Mark (2008). A Royal Home in Wales: Llwynywermod. Accent Press. (North Wales) ISBN 978-1-906373-60-3.
- Official LLwynywermod (North Range) Duchy of Cornwall property
- Official LLwynywermod (West Range) Duchy of Cornwall property
- BBC NEWS: "In pictures: Charles' Welsh home"
- Daily Telegraph: "Head to Wales to find a farm fit for a Prince"
- This Is London: "Pictured: Inside Charles and Camilla's new eco-friendly Welsh home"
- The Times: "After 37 years as Prince of Wales, Charles finally buys a home there"
- BBC NEWS: "Royal History of Charles' Estate"
- Sunday Times: "The Windsors' Holiday Home in Wales"