Libanus is a village in the Brecon Beacons National Park, in the southern part of county of Powys, Wales, United Kingdom, and in the community of Glyn Tarell. Presumably, the name of the village derives from Mount Lebanon, also known as the Lebanon Mountains, the ancient name for which was Libanus, a common name for chapels in Wales. It lies on the A470 road approximately 1 mile north-east of its junction with the A4215 road, and approximately 5 miles south-west of Brecon.