St Athan is a village and community in the Vale of Glamorgan in South Wales. The village and its parish church are dedicated to Saint Tathan. The church dates to the 13th–14th century, though an earlier church was dated to the Norman period. The village and the adjacent dormitory village of Eglwys Brewis are known primarily for the MOD St Athan RAF base. There are two pubs in the village, as well as a football team at St Athan Football Club and the St Athan Golf Club. The community includes West Aberthaw.

The Vale of Glamorgan, locally referred to as The Vale, is a county borough in the south-east of Wales. It borders Bridgend County Borough to the west, Cardiff to the east, Rhondda Cynon Taf to the north, and the Bristol Channel to the south. With an economy based largely on agriculture and chemicals, it is the southernmost unitary authority in Wales. Attractions include Barry Island Pleasure Park, the Barry Tourist Railway, Medieval wall paintings in St Cadoc's Church, Llancarfan, Porthkerry Park, St Donat's Castle, Cosmeston Lakes Country Park and Cosmeston Medieval Village. The largest town is Barry. Other towns include Penarth, Llantwit Major, and Cowbridge. There are many villages in the county borough.