The Church of St Margaret Marloes is the Church in Wales parish church of the parish of Eglwyscummin, in south-western Carmarthenshire, Wales. The present building dates from the 14th and 15th centuries, with restoration work undertaken in 1878 and again in 1900. The church has a circular churchyard, indicating that the site has likely been in use since prehistoric times. A tombstone dating to the fifth century was found in the churchyard. It is believed that Saint Cynin founded the church as one of a series of missionary stations in the fifth century.