Coordinates: 51°59′24″N 4°32′56″W / 51.99°N 4.548889°W / 51.99; -4.548889
Clydau (sometimes Clydaï or Clydey) is a village, parish, and community in the Hundred of Cilgerran in Pembrokeshire, Wales. The village is a small group of houses around the parish church, 8 km southwest of Newcastle Emlyn and 13 km southeast of Cardigan. Although the village is tiny, the parish is large, encompassing several larger hamlets including Bwlchygroes and Star, the village of Tegryn, and a large number of scattered farms. The community consists essentially of the parishes of Clydey and West Cilrhedyn (3 km to the east: church at 51°59′9″N 4°30′32″W / 51.98583°N 4.50889°W / 51.98583; -4.50889).
The meaning of the Welsh placename is uncertain, although the church is now dedicated to Ste. Clydaï, an alleged daughter of Brychan. During the early Middle Ages, the present town was the site of Llangeneu ('St Ceneus'), which was accounted one of the seven principal sees of Dyfed despite having no endowment of land.
Clydau is an electoral ward in Pembrokeshire, Wales. The ward consists of the communities of Boncath and Clydau.
A ward of Pembrokeshire County Council since 1995 it was previously a ward of the former Preseli Pembrokeshire District Council. The population of this ward taken at the 2011 census was 1,451.