Cilrhedyn is a hamlet and parish^{[clarification needed]} in the counties of Carmarthenshire and Pembrokeshire, Wales, in the hill country to the south of the Teifi valley. The Afon Cych divides it into two unequal parts: West Cilrhedyn, Pembrokeshire and East Cilrhedyn, Carmarthenshire. The parish church is in West Cilrhedyn.

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Cilrhedyn
Cilrhedyn Location within Pembrokeshire
OS grid reference	SN277350
Community	Clydau Cenarth
Principal area	Pembrokeshire Carmarthenshire
Country	Wales
Sovereign state	United Kingdom
Police	Dyfed-Powys
Fire	Mid and West Wales
Ambulance	Welsh
UK Parliament	Preseli Pembrokeshire Carmarthen West and South Pembrokeshire
Senedd Cymru – Welsh Parliament	Preseli Pembrokeshire Carmarthen West and South Pembrokeshire
List of places UK Wales Pembrokeshire 51.9771°N 4.5027°W / 51.9771; -4.5027

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The placename is Welsh, meaning "bracken nook".^[1] The area is largely Welsh-speaking. The parish appeared on a 1578 parish map of Pembrokeshire as Kilryden.^[2]

The parish of West Cilrhedyn (Pembrokeshire) is now part of the community of Clydau. It had an area of 887 Ha, and consisted entirely of scattered farms. Its census populations were: 215 (1801): 257 (1851): 190 (1901): 127 (1951): 105 (1981). The percentage Welsh speakers was 100 (1891); 97 (1931); 94 (1971).

The parish of East Cilrhedyn (Carmarthenshire) was merged with the parish of Cenarth in 1934, and it is now part of the community of Cenarth. It had an area of 2238 Ha, and included the villages of Capel Iwan 51°59′55″N 4°29′32″W and Cwmorgan 51°59′12″N 4°29′8″W. Its census populations were: 517 (1801): 806 (1851): 691 (1901): 570 (1931). The percentage Welsh speakers was 100 (1891); 99 (1931).