Somerset ( / ˈ s ʌ m ər s ɛ t / or / ˈ s ʌ m ər s ɪ t /) is a county in South West England. The county town of Somerset is Taunton, which is in the south of the county. The ceremonial county of Somerset borders the counties of Bristol and Gloucestershire to the north, Wiltshire to the east, Dorset to the south-east, and Devon to the south-west. It is partly bounded to the north and west by the coast of the Bristol Channel and the estuary of the River Severn. The traditional northern border of the county is the River Avon, but the administrative boundary has crept southwards, with the creation and expansion of the City of Bristol, and latterly the county of Avon and its successor Unitary Authorities in the north.

Somerset is a rural county of rolling hills such as the Mendip Hills, Quantock Hills and Exmoor National Park, and large flat expanses of land including the Somerset Levels. There is evidence of human occupation from Neolithic times, and subsequent settlement in the Roman and Saxon periods. Later, the county played a significant part in the consolidation of power and rise of King Alfred the Great, the English Civil War and the Monmouth Rebellion.

Agriculture is a major business in the county. Farming of sheep and cattle, including for wool and the county's famous cheeses (most notably Cheddar), are traditional and contemporary, as is the more unusual cultivation of willow for basketry. Apple orchards were once plentiful, and to this day Somerset is known for the production of strong cider. Unemployment is lower than the national average, and the largest employment sectors are retail, manufacturing, tourism, and health and social care. Population growth in the county is higher than the national average.