Cilrhedyn is a hamlet and parish in east Pembrokshire, with its north, east and south boundaries with Carmarthenshire. Formerlly the parish also included the east bank of the Afon Bardd, but in 1934 East Cilrhedyn was merged with the parish of Cenarth, Carmarthenshire.
Trelach is to the south, Cwmorgan immediately on the east boundary where the Afon Bardd flows from the east, and forms the north boundary, south of Capel Iwan.
The nearest locality to the west is Tegryn.