St. Mary's Church is a parish in the Diocese of the Central Gulf Coast of the Episcopal Church based in Milton, Florida. It is noted for its historic Carpenter Gothic-style church and its adjacent rectory, also known as the McDougall House, located at 300 Oak Street, now 6841 Oak Street. On May 6, 1982, it was added to the U.S. National Register of Historic Places as "St. Mary's Episcopal Church and Rectory." The church celebrated its sesquicentennial anniversary in 2017.