Lisbon Treaty

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Poland's President Lech Kaczynski stands at the front holding an open signed document, with Donald Tusk, Fredrik Reinfeldt, Jose Manuel Barroso, and another official behind him. European and Polish flags are in the background.

Map of the United Kingdom showing regional results of the 2016 EU Referendum. Scotland, Northern Ireland, and London are shaded blue to indicate a majority voted to remain in the European Union, while the rest of England and Wales are shaded red to show a majority voted to leave.

Theresa May and Brexit

Lisbon Treaty: References & Edit History

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The European Community

Article Contributors

Primary Contributors

Michael Ray
Michael Ray is an assistant managing editor who has worked at Britannica since 2003. In addition to leading the Geography and History team, he oversees coverage of European history and military affairs. He earned a B.A. in history from Michigan State University in 1995.

Other Encyclopedia Britannica Contributors

Article History

Type	Description	Contributor	Date
	Modified link of Web site: European Parliament - The Treaty of Lisbon.	Emily Rodriguez	Apr 24, 2026
	Add new Web site: Oxford Public International Law - Lisbon Treaty.	Gloria Lotha	Mar 13, 2026
	Anniversary information added.		Nov 24, 2025
	Add new Web site: WIPO - Lisbon Agreement for the Protection of Appellations of Origin and their International Registration.	Grace Young	Sep 13, 2025
	Add new Web site: European Parliament - The Treaty of Lisbon.	Grace Young	Jun 02, 2025
	Link added.	The Editors of Encyclopaedia Britannica	Jul 19, 2023
	Updated for Britain's formal invocation of Article 50.	Michael Ray	Mar 29, 2017
	Updated with the results of the "Brexit" referendum.	Michael Ray	Jun 28, 2016
	Add new Web site: United States Air Force Air War College at The Air University - The European Union�s Reform Process: The Lisbon Treaty.	Emily Rodriguez	May 23, 2016
	Add new Web site: Republic of Turkey, Ministry for European Union Affairs - Guide to the Lisbon Treaty.	Emily Rodriguez	May 20, 2016
	Add new Web site: Internet Archive - Abraham Lincoln Volume 1 The Prairie Years Carl Sandburg.	Emily Rodriguez	May 20, 2016
	Add new Web site: British Library - The Treaty of Lisbon.	Aakanksha Gaur	Nov 23, 2015
	Add new Web site: Europa - Treaty of Lisbon.	Darshana Das	Aug 08, 2011
	Clarified that the rotating EU presidency has been retained, with a modified mandate.	Heather Campbell	Jan 08, 2010
	Updated with the Lisbon Treaty's entry into force.	Heather Campbell	Dec 01, 2009
	New images added.	Michael Ray	Nov 30, 2009
	New article added.	Michael Ray	Nov 25, 2009