Llwynywermod (Welsh: Llwynywermwd Welsh pronunciation: [ɬʊi̯n.ə.wɛr.mʊd]), 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 3.2 km (2 mi) from the estate.