This is a list of Grade I listed buildings in Wiltshire, England, in the United Kingdom. These buildings are protected for their historic significance. There is a parallel system for ancient monuments, known as 'scheduling', which means that there is not a consistent approach to sites like castles, abbeys and henges, which may be listed, scheduled or both. In England, the listing is administered by Historic England, an agency of the government's Department for Digital, Culture, Media and Sport.