St. Mary's Church is a Grade 1 listed Anglican church in Chesham, Buckinghamshire, and is part of the Diocese of Oxford. Built on the site of a Bronze Age stone circle of puddingstones, parts of the church building date to the 12th century. Remodelled in the 15th and 17th centuries, the church is architecturally a mixture of English Gothic styles. Weakened by additions to the church tower and undermined by burials in and around the church, by the 19th century the building was structurally unsound. The church was remodelled and strengthened in the 1860s by George Gilbert Scott and again in the 20th century by Robert Potter.