Wainfleet St Mary is a village and civil parish in the East Lindsey district of Lincolnshire, England.

[5] The limestone Grade II listed church is dedicated to Saint Mary and dates from the 12th century, being restored in 1875 and 1892.

Inside is a 15th-century font and a black and white marble monument, with broken pediment, to Edward Barkham who died in 1724.

One hundred yards (91 m) south of the nave is the remains of a 14th-century stone cross, which is both a scheduled monument and Grade II listed.

[7] There is a Grade II listed windmill at Mill Garage built of red brick in the early 19th century.