Cwmdauddwr (rarely referred to by its correct full name of Llansanffraid Cwmteuddwr) is a village in Powys, Wales. It is contiguous with the town of Rhayader on the opposite side of the River Wye. The village is located on the B4518 road linking Rhayader with the Elan Valley Reservoirs. The village is home to a number of local shops, a pub (The Triangle Inn), village hall and a parish church dedicated to St Bride (Welsh: Sant Ffraid). The Groe, a large park on the banks of the river, has walks, play areas and sports pitches.