Mersham is a large village about 3 miles E of Willesborough near Ashford, Kent. The church of St John the Baptist was described by Stephen Glynne in 1877 as 'rather a handsome church, with some singularities, and portions of various styles'. It has nave with S aisle, chancel with S chapel, tower and porch. There is a Romanesque S doorway.

A church here is mentioned in Domesday Book.

The rustic character of the doorway mouldings with the prominent imposts and the early foundation date makes one wonder if this is an early post-Conquest (or even mid-11thc.) example.