Coordinates: 51°38′10″N 2°42′13″W / 51.6361°N 2.7036°W / 51.6361; -2.7036
Mounton is a hamlet in Monmouthshire, south east Wales, United Kingdom, located two miles west of Chepstow in a rural setting.
The parish was originally part of the holdings of Chepstow Priory, with the name Monktown. It has a tiny parish church dedicated to St. Andoenus, which was almost wholly rebuilt in 1880 and which lies in the Parish of Mathern and Mounton with St Pierre.
St. Andoenus has been identified by some with St. Owen, and by others as an obscure Greek saint. It has been suggested that he was initially a 7th-century French scribe, but became Bishop of Rouen and Chancellor to three French monarchs. He is represented in the Grouped Parish logo by the quill of the scribe.
The furnishings in the Sanctuary are mainly a memorial to Capt. Ian Oswald Lidell, VC, 5th Battalion Coldstream Guards, killed in action in 1945. The stained glass windows are memorials to the Evill and Bragington families. One of the gravestones, to a Christopher Cooper who died on 8 April 1680, indicates that the churchyard is much older than the present church building.