St Olaf's Church in Wasdale Head, Cumbria, is England's smallest parish church. The earliest record of a church on this site is from 1550, though it is likely that there was an earlier church on this site.
Wikipedia https://en.wikipedia.org/wiki/Church_of_St_Olaf,_Wasdale
Address (Unnamed Road), CA20 1EX, United Kingdom
Coordinates 54°28'1.555" N -3°15'12.812" E