St Mary's Church is an Anglican church and the parish church of Welford. It is a Grade II* listed building and stands on the east side of the junction of Church Lane and West Street. There was presumably a church at Welford by 1086, when the Domesday Book records the presence of a priest there, although it does not mention a church building as such. The parish registers survive from 1561, the historic registers being deposited at Northamptonshire Record Office. Welford is part of a united benefice along with Marston Trussell and Sibbertoft. Each parish retains its own church building.