Same-sex marriage has been legal in Ireland since 16 November 2015. A referendum on 22 May 2015 amended the Constitution of Ireland to provide that marriage is recognised irrespective of the sex of the partners. The measure was signed into law by the President of Ireland as the Thirty-fourth Amendment of the Constitution of Ireland on 29 August 2015. The Marriage Act 2015, passed by the Oireachtas on 22 October 2015 and signed into law by the Presidential Commission on 29 October 2015, gave legislative effect to the amendment. Marriages of same-sex couples in Ireland began being recognised from 16 November 2015 and the first marriage ceremonies of same-sex couples in Ireland occurred on 17 November 2015.
Civil partnerships, granted under the Civil Partnership and Certain Rights and Obligations of Cohabitants Act 2010, gave same-sex couples rights and responsibilities similar, but not equal, to those of civil marriage.
The 2011 Irish census revealed 143,600 cohabiting couples, up from 77,000 in 2002. This included 4,042 in same-sex relationships, up from 1,300.
In December 2000, as part of the Second Programme of Law Reform, the Government requested the Law Reform Commission of Ireland to examine the rights and duties of cohabitees. In April 2004, the commission published a consultation paper with provisional recommendations on legal issues related to cohabiting relationships. The report included an analysis of issues for same-sex couples. Following responses, the final report was launched in December 2006 by Justice Minister Michael McDowell.