The history of Guernsey stretches back to evidence of prehistoric habitation and settlement and encompasses the development of its modern society.

Guernsey (/ˈɡənzi/ (About this sound listen)) is an island in the English Channel off the coast of Normandy. It lies roughly north of St Malo and to the west of the Cotentin Peninsula. With several smaller nearby islands, it forms a jurisdiction within the Bailiwick of Guernsey, a Crown dependency. The jurisdiction is made up of ten parishes on the island of Guernsey, three other inhabited islands (Herm, Jethou and Lihou), and many small islets and rocks. The jurisdiction is not part of the United Kingdom, although defence and most foreign relations are handled by the British Government.[4]

The entire jurisdiction lies within the Common Travel Area of the British Isles and is not a member of the European Union, but has a special relationship with it, being treated as part of the European Community with access to the single market for the purposes of free trade in goods. Taken together with the separate jurisdictions of Alderney and Sark it forms the Bailiwick of Guernsey. The two Bailiwicks of Guernsey and Jersey together form the geographical grouping known as the Channel Islands.