Coelbren

thumb|right|A Neath-Brecon train at Coelbren Junction shortly before closure in December 1962 thumb|right Coelbren () is a small rural village within the community of Tawe Uchaf in southernmost Powys, Wales. It lies on the very northern edge of the South Wales Coalfield some six miles north-east of Ystradgynlais and just outside the southern boundary of the Brecon Beacons National Park. It is known for Henrhyd Falls, a 27m high waterfall which serves as a National Trust-managed visitor attraction on the Nant Llech. To the east of the village flows the Afon Pyrddin which plunges over two more spectacular falls.

As first edition Ordnance Survey maps of the area show, the name 'Coelbren' applied to a farmhouse and chapel before the modern village developed and is recorded in the name Tyre y Kolbren in 1503 where it signifies the sharing of land (modern Welsh 'tir') by means of drawing lots, a 'coelbren' being translated amongst other things as an 'inscribed piece of wood' or 'omen-stick'.