Plas Uchaf (English: Upper Hall) is a 15th-century cruck-and-aisle-truss hall house, 1.5 miles (2.4 km) south-west of Corwen, Denbighshire, Wales and 1 mile (1.6 km) north of Cynwyd. Its excellent workmanship indicates a house originally of considerable importance; it has been described as "of palatial significance".