The Church of St Teilo is the parish church of Llantilio Pertholey, Monmouthshire, Wales. "An unusually large and varied church",^[1] it is a Grade I listed building as of 1 September 1956^[2]

The church is thirteenth century in origin with significant additions in the sixteenth century, a major restoration in 1890 and further minor restoration in the twentieth century.^[3] The tower is of the early fourteenth century and the aisle of slightly later date.^[1] Around the chancel are three chantry chapels, the church's "most memorable" features.^[1] The bell tower holds six bells, dating from the seventeenth century.^[4]

Services are held at the church on Wednesdays, Fridays and Sundays.^[4]