Clytha (Welsh: Cleidda) is a hamlet and historical area in Monmouthshire, Wales.

The castle, the park and The Clytha Arms public house,[1] however, lie on the southern side of the A40.

The hamlet lies within the parish of Llanarth and covered 1841 acres with a population of 361 people in 1861.

[3] Great House, Clytha is a Grade II listed building.

[4] The Clytha Arms, a converted Dower house, holds an annual Cider Festival on May Bank Holidays.