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Cwmdu or Llanfihangel Cwmdu is a small village situated in the heart of the Black Mountains in Powys, Wales. Its name is derived from the Welsh language "Cwm Du", which means 'Black Valley'. It is located on the A479 Talgarth to Tretower road. Nearby towns include Crickhowell and Abergavenny.
Cwmdu has several public facilities, including a park, a village pub, the Farmers Arms and a cafe, the Mynydd-Ddu Tea Room.
Its former primary school, which opened in 1873 and was visited by Prince Charles in 2006, closed in 2012 and the building now occupies an art gallery.
Cwmdu attracts many tourists every year, who mainly consist of hikers hillwalking through on the Beacons Way. Cwmdu is an attractive hiking destination as it is situated in the heart of the Black Mountains, and is only about 12 miles away from Pen-Y-Fan; the highest mountain range in South Wales and within the region's National Park.
In September 2012 Cwmdu was the site for the bi-annual AstroCamp. This saw a large gathering of astronomers and was televised by the BBC The Sky at Night programme the following October.
- "Church of St Michael, Llanfihangel Cwmdu with Bwlch and Cathedine". British Listed Buildings. Retrieved 1 January 2015.