Llanfihangel Nant Melan is a small village in Powys, Wales, in the ancient county of Radnorshire. It is around 7 miles (11 km) from the English border. It is in the community of New Radnor.
The village lies in a valley on the A44 road on the edge of the Radnor Forest, and is home to a church and two pubs. The A481 road from Builth joins the A44 near here.