Wiltshire ( /ˈwɪltʃər/ or /ˈwɪltʃɪər/, formerly /ˈwɪlʃər/; or the County of Wilts) is a ceremonial county in South West England. It is landlocked and borders the counties of Dorset, Somerset, Hampshire, Gloucestershire, Oxfordshire and Berkshire. It contains the unitary authority of Swindon and covers 3,485 km² (1,346 square miles). The ancient county town was Wilton, but since 1930 Wiltshire County Council and its successor Wiltshire Council (from 2009) have been based at Trowbridge.

Wiltshire is characterised by its high downland and wide valleys. Salisbury Plain is famous as the location of the Stonehenge and Avebury stone circles and other ancient landmarks and as the main training area in the UK of the British Army. The city of Salisbury is notable for its mediaeval cathedral. Important country houses open to the public include Longleat, near Warminster, and the National Trust's Stourhead, near Mere.

The county, in the 9th century written as Wiltunscir, later Wiltonshire, is named after the former county town of Wilton, itself named after the river Wylye, one of eight rivers which drain the county.

Stephen Wiltshire MBE, (born 24 April 1974) is a British architectural artist of West Indian ancestry who has been diagnosed with autism. He is known for his ability to draw from memory a landscape after seeing it just once. His work has received worldwide popularity.

In 2006, Wiltshire was made a Member of the Order of the British Empire (MBE) for services to art. In the same year, he opened a permanent gallery on the Royal Opera Arcade in London.

Wiltshire was born in London, England, in 1974 to West Indian parents. Wiltshire was mute when young. At age three, he was diagnosed as autistic. The same year, his father died in a motorcycle accident.

At age five, Stephen was sent to Queensmill School in London where he expressed interest in drawing. He began to communicate through his art. His teachers encouraged his drawing, and with their aid Wiltshire learned to speak at the age of five. At the age of eight, he started drawing imaginary post-earthquake cityscapes and cars. When he was ten, Wiltshire drew a sequence of drawings of London landmarks, one for each letter, that he called a "London Alphabet".