South West England is one of the regions of England defined by the Government of the United Kingdom for statistical and other purposes. It is the largest such region in area, covering 9,200 square miles (23,828 km²) and comprising Bristol, Gloucestershire, Somerset, Dorset, Wiltshire, Devon, Cornwall and the Isles of Scilly. Five million people live there. The region includes the area often known as the West Country, and much of Wessex. The size of the region is shown by the fact that the northern part of Gloucestershire, near Chipping Campden, is as close to the Scottish border as it is to the tip of Cornwall. The largest city is Bristol. Other major urban centres include Plymouth, Swindon, Gloucester, Exeter, Bath, and the South East Dorset conurbation of Bournemouth, Poole and Christchurch.

The region includes two National Parks and four World Heritage Sites, including Stonehenge.