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Same-sex marriage is legal in all parts of the Bailiwick of Guernsey, a Crown Dependency of the United Kingdom. Legislation to open marriage to same-sex couples in Guernsey was passed by the States of Guernsey on 21 September 2016, and took effect on 2 May 2017. Same-sex marriage laws took effect in Alderney on 14 June 2018, and Sark on 23 April 2020.
The Bailiwick of Guernsey has never recognised civil partnerships, and prior to 2017 was the sole region in the British Isles to not recognise same-sex couples in any form.