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British Crown Dependency consisting of several islands
the whole territory of the Bailiwick of Guernsey

The Bailiwick of Guernsey (; Guernésiais: Bailliage dé Guernési) is a self governing British Crown Dependency off the coast of Normandy, France, comprising several of the Channel Islands. It has a total land area of and an estimated total population of 67,334. The Channel Islands were part of the Duchy of Normandy, whose dukes became kings of England from 1066. In 1204, as a consequence of the Treaty of Le Goulet, insular Normandy alone remained loyal to the English Crown, leading to a political split from the mainland. Around 1290, the Channel Islands' Governor, Otto de Grandson, split the archipelago into two bailiwicks, establishing those parts other than Jersey as a single Bailiwick of Guernsey. Its defence and international representation – as well as certain policy areas, such as nationality law – are the responsibility of the UK Government, but the Bailiwick still has a separate international identity.

The history of the Bailiwick of Guernsey goes back to 933, when the islands came under the control of William Longsword, having been annexed from the Duchy of Brittany by the Duchy of Normandy. The island of Guernsey and the other Channel Islands formed part of the lands of William the Conqueror. In 1204, France conquered mainland Normandy – but not the offshore islands of the bailiwick. The islands represent the last remnants of the medieval Duchy of Normandy. Initially, there was one governor, or co governors working together, of the islands making up the Channel Islands. The title "governor" has changed over the centuries. "Warden", "keeper", and "captain" have previously been used. The bailiff stands in for the Governor, or more recently the Lieutenant Governor, if the latter is absent, for a short term or for longer: for instance during the five years of the German occupation of the Channel Islands. The Lieutenant Governor of Guernsey is the Lieutenant Governor of the Bailiwick of Guernsey and, being the personal representative of the British monarch, has usually had a distinguished military service. Originally, the local courts in Guernsey were "fiefs" with the lord of the manor presiding. Before 1066, a superior court was introduced above the fiefs and below the Eschequier Court in Rouen and comprised the bailiff and four knights; the court heard appeals and tried criminal cases. Otton de Grandson, then the governor of the Islands, delegated the civil powers to two separate bailiffs for Guernsey and Jersey before he went on crusade to the Holy Land in 1290. This can be assessed as the date of first creation of the two bailiwicks.

Situated around , Alderney, Guernsey, Herm, Sark, and some other smaller islands together have a total area of and coastlines of about Elevation varies from sea level to at Le Moulin on Sark. There are many smaller islands, islets, rocks and reefs in the Bailiwick. Combined with a tidal range of and fast currents of up to , sailing in local waters is dangerous.

The bailiwick comprises twelve parishes: Alderney, Sark, and ten on mainland Guernsey (one of which includes Herm). Each parish has a parish church dating from the 11th century, with strong religious control exercised initially by the French Catholic church and for the last 500 years by the English church. Over the years, the religious aspect of the administration of each parish has been reduced in favour of democratically elected douzeniers.

Each jurisdiction has inhabited and uninhabited islands and its own elected government. All three legal jurisdictions need royal assent from the Monarch on its primary legislation, but as of February 29, 2024, certain domestic primary legislation need only the Lieutenant Governor's assent. Each jurisdiction raises its own taxation,

Sark has a population of around 600 who live in 2 square miles (5 km2). Its parliament (together with the inhabited island of Brecqhou)

There is no flag or coat of arms for the Bailiwick of Guernsey. In historic times, the governor would have used his personal symbols before a generic flag was created for use by the governor. In 1279, Edward I granted a Seal for use in the Channel Islands. In 1304, separate seals were provided to Jersey and Guernsey. The provision of different seals is one of the earliest indications of the individual identity and personality of the two Bailiwicks. The seal comprised three leopards (or lions), a symbol taken from the original arms of the Duchy of Normandy. The United Kingdom and His Majesty's Government in the United Kingdom are responsible for the defence and also for formal international, intergovernmental, and consular representation of, and the foreign affairs generally, of the Bailiwick. to advise the Channel Islands' governments on European matters, and to promote economic links with the EU. The Bailiwick of Guernsey is in the Commonwealth (Commonwealth of Nations), although not as a member, in its own right. The Bailiwick is also a member of the Commonwealth Games Federation and competes in the Commonwealth Games. In 1969, Royal Mail relinquished control of postal services in the Bailiwick, with Guernsey then being recognised by the Universal Postal Union. Since 1999, the Bailiwick of Guernsey has been a member of the British–Irish Council, currently represented by the Chief Minister of Guernsey.