Erwood is a village and community lying beside the River Wye, on the A470 road some 6 miles south-east of Builth Wells in Powys, Wales. The population of the community taken at the 2011 census was 429. It is in the historic county of Brecknockshire (Breconshire) and the older cantref of Cantref Selyf. The community includes the settlements of Crickadarn, Gwenddwr and Llaneglwys.