← 2006 2005 2004 2007 in the European Union → 2008 2009 2010
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See also:	Other events of 2007 Timeline of EU history

Events from the year 2007 in the European Union.

Incumbents

• Commission President – José Manuel Barroso, People's Party
• Council Presidency – Germany (January–June) and Portugal (July–December)
• Parliament President – Josep Borrell, Socialists (to 16 January). Hans-Gert Pöttering, People's Party
• High Representative – Javier Solana, Socialists

Events

• 1 January – Bulgaria and Romania join the European Union.^[1]
• 1 January – Slovenia adopts the Euro as its official currency, replacing the tolar.^[2]
• 1 January – Irish becomes the 23rd official language of the EU.^[3]
• 1 January – Germany takes over the EU Presidency.^[4]
• 9 January – far right MEPs form a political group called Identity, Tradition and Sovereignty.^[5]
• 25 March – Berlin Declaration signed to mark the 50th anniversary of the Treaty of Rome.
• 1 June – The REACH directive, described as "most important piece of EU legislation for 20 years", comes into force.^[6]
• 23 June – EU leaders agree to a Reform Treaty (later named Treaty of Lisbon) to replace the Treaty establishing a Constitution for Europe rejected by Dutch and French voters in referendums.^[7]
• 1 July – Portugal takes over the Presidency from Germany.^[4]
• 23 July – Intergovernmental Conference on the Treaty of Lisbon starts.^[8]
• 13 December 2007 – Signing of the Treaty of Lisbon
• 21 December – Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia and Slovenia implement the Schengen Agreement for overland borders and seaports.^[9]