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Article 50 of the Treaty on European Union (TEU) provides for the possibility of an EU member state leaving the European Union "in accordance with its own constitutional requirements".^[1]

Currently, the United Kingdom is the only state to have withdrawn from membership of the European Union. The process to do so began when the UK Government triggered Article 50 to begin the UK's withdrawal from the EU on 29 March 2017 following a June 2016 referendum, and the withdrawal was scheduled in law to occur on 29 March 2019.^[2] Subsequently, the UK sought, and was granted, a number of Article 50 extensions until 31 January 2020. On 23 January 2020, the withdrawal agreement was ratified by the Parliament of the United Kingdom, and on 29 January 2020 by the European Parliament. The UK left the EU on 31 January 2020 at 23:00 GMT, ending 47 years of membership.^[3]^[4]

Four territories of EU member states have withdrawn: French Algeria (in 1962, upon independence),^[5] Greenland (in 1985, following a referendum),^[6] Saint Pierre and Miquelon (also in 1985, unilaterally)^[7] and Saint Barthélemy (in 2012),^[8] the latter three becoming Overseas Countries and Territories of the European Union.

^ "Article 50". Eurostep. Archived from the original on 25 June 2016. Retrieved 23 August 2018.
^ "Confirmation of UK Government agreement to Article 50 extension". GOV.UK. Archived from the original on 1 April 2019. Retrieved 22 March 2019.
^ "MPs back Johnson's plan to leave EU on 31 January". BBC News. 20 December 2019. Archived from the original on 28 December 2019. Retrieved 9 August 2020.
^ "Brexit: European Parliament overwhelmingly backs terms of UK's exit". BBC News. 29 January 2020. Archived from the original on 29 January 2020. Retrieved 29 January 2020.
^ Ziller, Jacques. "The European Union and the Territorial Scope of European Territories" (PDF). Archived from the original (PDF) on 7 April 2014. Retrieved 31 March 2014.
^ "What is Greenland's relationship with the EU?". Folketing. Archived from the original on 4 November 2016. Retrieved 20 June 2016.
^ Cite error: The named reference stptm was invoked but never defined (see the help page).
^ Hay, Iain (2013). Geographies of the superrich. Edward Elgar Publishing. p. 196. ISBN 978-0-85793-569-4. Archived from the original on 25 June 2016. Retrieved 20 January 2015.