Trellech (occasionally spelt Trelech, Treleck or Trelleck) (Modern Welsh: Tryleg) is a village in Monmouthshire, south-east Wales, near Monmouth and the location of an archaeological site. The village is designated as a Conservation Area. The village gives its name to the community of Trellech United, in which the village is situated.
The name of the village derives from the Welsh language and means either “the town (tre) of slates (llech)” or “three (tri) slates (llech)”. There are three standing stones in the village, known as Harold’s Stones. There are 26 known spellings for the village, including those mentioned above which can be found on road signs at three of the six entrances into the village.
The Church of St Nicholas is a Grade I listed building.