Twenty-eighth Amendment of the Constitution Bill, 2008 (Ireland)

The Twenty-eighth Amendment of the Constitution Bill 2008 was a failed proposal to amend the Constitution of Ireland that was put to a referendum in 2008 (the first Lisbon referendum). The purpose of the proposed amendment was to enable the state to ratify the Treaty of Lisbon of the European Union.

The amendment was rejected by voters on 12 June 2008 by a margin of 53.4% to 46.6%, with a turnout of 53.1%. The treaty had been intended to enter into force on 1 January 2009, but had to be delayed following the Irish rejection. However the Lisbon treaty was eventually approved by Irish voters when the successful Twenty-eighth Amendment of the constitution was approved in the second Lisbon referendum, held in October 2009.

A 1987 decision of the Supreme Court established that ratification by Ireland of any significant amendment to the Treaties of the European Union requires an amendment to the Constitution of Ireland. All Constitutional amendments require approval by referendum.

A referendum on the Treaty establishing a Constitution for Europe of the European Union was expected to be held in 2005 or 2006 but was cancelled following the rejection of the Constitution by voters in France in May 2005 and in the Netherlands in June 2005. The Treaty of Lisbon represents the European-wide political compromise that was agreed upon in the wake of the rejection of the Constitution. It preserves most of the content of the Constitution, especially the new rules on the functioning of the European Institutions, but gives up any symbolic or terminologic reference to a Constitution. (See Treaty of Lisbon compared to the European Constitution.)

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