St Tewdric's Church is a Church in Wales parish church in Mathern, Monmouthshire, Wales. It is purportedly built over the resting place of Saint Tewdrig for whom it is named. A church has been located on the site since the 6th century. It was reconstructed by the Normans in the Early English style, and later was renovated by the Victorians. It is a Grade I listed building.