Llandrindod Wells is a town and community in Powys, Wales. It serves as the seat of Powys County Council, and is therefore the administrative centre of Powys. The town was historically in Radnorshire. Llandrindod Wells developed as a spa town in the 19th century, with a boom in the late 20th century as a centre of local government. Before the 1860s the site of the town was common land in Llanfihangel Cefnllys parish. Llandrindod Wells is the fifth largest town in Powys.