Hayscastle, or Hays-Castle (Welsh: Cas-lai or Castellhaidd), is a village, parish and community of Pembrokeshire in West Wales, 7½ miles (N. W. by N.) from Haverfordwest on the B4330 road.

[4] The large rural parish is recorded as having been for the greater part inclosed and in a good state of cultivation.

[5] In 1870–72, John Marius Wilson's Imperial Gazetteer of England and Wales recorded a parish population of 297 and 62 houses in an area of 4,462 acres (1,806 ha).

[6] RAF Hayscastle Cross Chain Home early warning radar installation was situated here during the Second World War.

[4] The village has a History and Environment Society, Women's Institute, Neighbourhood Watch and Young Farmers' Club.