Llanfoist Fawr is a community in the county of Monmouthshire, Wales, and is located 23.8 miles (38.3 km) from Cardiff and 126.3 miles (203.2 km) from London. In 2011 the population of Llanfoist Fawr was 3217 with 10.2% of them able to speak Welsh.

The community includes the villages of Govilon,