Cwmdauddwr (rarely referred to by its correct full name of Llansanffraid Cwmteuddwr[1]) is a village in Powys, Wales.

The parish of Cwmdauddwr corresponds approximately to the medieval commote of Cwmwd Deuddwr (Welsh for 'Commote of the Confluence'; lit.

The Groe, a large park on the banks of the river, has walks, play areas and sports pitches.

It contains some older memorials and some of the foundations of an earlier church, that stood on the same site, are still traceable in the churchyard near the east wall.

[7] The plaque was saved from Nantgwyllt church when the Elan Valley was flooded between 1896 and 1905 to create the Caban Coch reservoir,[8] it notes that Lewis Lloyd was the eighth woman to climb Mont Blanc.