Llangar is a former civil parish in Denbighshire in Wales, 1 mile (1.6 km) south west of Corwen, its post town, and 10 miles (16 km) north east of Bala. It is situated at the confluence of the rivers Alwen and Dee, and includes the small hamlets of Bryn, Cymer, and Gwynodl. A large portion of the parish is barren. The small village stands on the road from Corwen, by the Vale of Edeyrnion. The Dee is crossed by a bridge about 1 mile (1.6 km) away at Cynwyd. It lies in the bro and former cwmwd of Edeirnion.