2007 in the European Union

Years in the European Union:	2004 2005 2006 2007 2008 2009 2010
Centuries:	20th century · 21st century · 22nd century
Decades:	1970s 1980s 1990s 2000s 2010s 2020s 2030s
Years:	2004 2005 2006 2007 2008 2009 2010

Events from the year 2007 in the European Union.

Incumbents

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]