Llangadog is a village and community located in Carmarthenshire, Wales, which also includes the villages of Bethlehem and Capel Gwynfe. A notable local landscape feature is Y Garn Goch with two Iron Age hill forts. Llangadog was the administrative centre of the commote of Perfedd and had a castle, destroyed in 1204. Although the borough declined in the Middle Ages, Llangadog retained its market, which was frequented by drovers into the 19th century.