St Mary's is an electoral ward in the town of Chepstow, Monmouthshire, Wales.

The St Mary's ward covers the town centre of the Chepstow, which includes the Priory parish church of the same name.

[1] According to the 2001 UK Census the population of the St Mary's ward was 1,741, rising to 1,847 by 2011.

[2] St Mary's is a community ward for elections to Chepstow Town Council.

[5] At the May 2017 elections Jez Becker won the seat back for the Liberal Democrats.