The States of Guernsey, officially the States of Deliberation and sometimes referred to as the Government of Guernsey, is the parliament and government of the British Crown dependency of Guernsey. Some laws and ordinances approved by the States of Guernsey also apply to Alderney and Sark as "Bailiwick-wide legislation" with the consent of the governments of those islands. All enactments of the States of Guernsey apply to Herm as well as Guernsey, since Herm is directly administered by the Bailiwick of Guernsey.

The Crown Dependencies are three offshore island territories in the British Islands that are self-governing possessions of the British Crown: the Bailiwick of Guernsey and the Bailiwick of Jersey, both located in the English Channel and together known as the Channel Islands, and the Isle of Man in the Irish Sea between Great Britain and Ireland.