Candleston Castle is a 14th-century fortified manor house, in ruins since the 19th century. It is southwest of Merthyr Mawr, former Glamorgan, Wales, and just northwest of Ogmore Castle, separated by the River Ogmore. Candleston's original long and narrow rectangular structure lay across the western end of a low narrow promontory, suggesting a defensive position. The castle is believed to be named after the Norman family of Cantilupe, thought to be its first feudal tenants.