Glasbury-on-Wye, is a village and community in Powys, Wales. The village lies at an important crossing point on the River Wye, connecting the historic counties of Brecknockshire and Radnorshire, and is located just outside the Brecon Beacons National Park, north of the Black Mountains.

Glasbury Castle, north of the river, was first mentioned in 1144 when it was granted (with the manor) to Walter de Clifford. In August 1233, the castle was attacked and captured by King Henry III following a baronial rebellion by the Cliffords, but little more is recorded after that, though it was still in existence in a survey of Glasbury Manor dated 1561.   Remains of its earthworks were visible near the centre of the village until housing development in the 1970s.