The Marriage Act 2015 (No. 35 of 2015; previously bill No. 78 of 2015) is an act of the Oireachtas which provides for same-sex marriage in Ireland. The act gives legislative effect in statute law to the Thirty-fourth Amendment of the Constitution of Ireland, which mandates such provision. It was introduced on 15 September 2015 and signed into law on 29 October 2015, and commenced (came into force) on 16 November 2015.