St John's Church, Letty Green, is a deconsecrated Gothic Revival church in Hertingfordbury, Hertfordshire, England.
The building was designed by George Fowler Jones. It was given a heritage listing (Grade II) in the 1960s. It went on the market in 2001 with planning permission for conversion to residential use. It has since been converted.
Coordinates: 51°46′54″N 0°08′11″W / 51.7817°N 0.1365°W