The Bailiwick of Guernsey (French: Bailliage de Guernesey) is a British Crown dependency in the English Channel off the coast of Normandy.

As well as the island of Guernsey itself, it also includes Alderney, Sark, Herm, Jethou, Brecqhou, Burhou, Lihou and other islets. Although the defence of all these islands is the responsibility of the United Kingdom, Guernsey is not part of the UK but rather a separate possession of the Crown, comparable to the Isle of Man. Guernsey is also not a member of the European Union. The island of Guernsey is divided into 10 parishes. Together with the Bailiwick of Jersey, it is included in the collective grouping known as the Channel Islands. Guernsey belongs to the Common Travel Area.