The Church of St Mary stands in the centre of the village of Magor, Monmouthshire, Wales.

[2] It is possible that the church was originally dedicated to Cadwaladr, the last Welsh ruler to call himself King of Britain, who died of the plague in 664 AD.

[2][4] John Newman, in his 2000 Gwent/Monmouthshire volume of the Pevsner Buildings of Wales series, describes St Mary's as "one of the most ambitious churches in the county, though the ambitions were not all realised.

"[5] The interior contains nineteenth-century, stained glass, including The Good Shepherd by Kempe & Co of 1930–31.

[5] The churchyard is the burial place of Welsh composer Mansel Thomas (1909–1986).