St Mary's Church is located in Huntingdon, Cambridgeshire, England. The church is said to have been the "Mother Church of Huntingdon". It probably occupies the original site of Huntingdon Priory of Austin Canons, founded here in 1140 by Eustace de Lovetot. It seems to have been used first as a parochial church on the removal of the priory to the east end of the town in the reign of Henry II. In July 1607, the building fell down, but the present church was commenced in March of the following year and was finished in 1620. It is a Grade I listed building.