South West England, or the South West of England, is one of the nine official regions of England in the United Kingdom. It consists of the counties of Cornwall, Dorset, Devon, Gloucestershire, Somerset and Wiltshire. Cities and large towns in the region include Bath, Bristol, Bournemouth, Cheltenham, Exeter, Gloucester, Plymouth and Swindon. It is geographically the largest of the nine regions of England with a land area of 9,203 square miles (23,836 km2), but the third-least populous, with approximately 5.7 million residents.

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.