Llanfoist Fawr is a community in the county of Monmouthshire, Wales, and is 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. This community includes the villages of Llanwenarth and Llanfoist itself. The name of the local school is also Llanfoist Fawr.