St Agnes is a civil parish and a large village on the north coast of Cornwall, England, United Kingdom. The village is about five miles (8 km) north of Redruth and ten miles (16 km) southwest of Newquay. An electoral ward exists stretching as far south as Blackwater. The population at the 2011 census was 7,565.

Cornwall is a ceremonial county in South West England. It is recognised by Cornish and Celtic political groups as one of the Celtic nations, and is the homeland of the Cornish people. The county is bordered by the Atlantic Ocean to the north and west, Devon to the east, and the English Channel to the south. The largest settlement is Falmouth, and the county town is the city of Truro.