The Church of St Catwg in Cwmcarvan, Monmouthshire, Wales, is a parish church dating from the late 13th or early 14th century. It is dedicated to Saint Catwg or Cadoc, a 5th/6th-century Welsh saint. The existing building dates mainly from the 15th century, including its Tudor tower dating from 1525. The church was extensively restored by John Prichard in 1872–1879. It is an active parish church and a Grade II* listed building.