St. Mary's Church is a Church of England church located in Welwyn, Hertfordshire, in England. It is north of the River Mimram and within the Welwyn conservation area. The present church building is a grade II listed building.
The chancel and nave of the church were built in the thirteenth century, most likely on the site of a destroyed Saxon chapel. The nave was modified to include a nave aisle in 1662, and its tower was rebuilt at this time. The church was further expanded between 1867 and 1870 with the addition of an organ chamber, a vestry and a choir aisle, the restoration being supported by Charles Willes Wilshere. The present tower was built in 1910 and the church house, constructed on the former northern part of the churchyard, was built in 2007.
As of November 2020, the church is open daily to members of the public.
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