Two referendums were held together in Ireland on 7 December 1972, each on a proposed amendment of the Irish constitution. Both proposals were approved by voters.
See main article: Fourth Amendment of the Constitution of Ireland. The Fourth Amendment to the constitution lowered the voting age for all national elections and referendums in the state from twenty-one to eighteen years of age
See main article: Fifth Amendment of the Constitution of Ireland. The Fifth Amendment to the constitution removed reference to "special position" of the Roman Catholic Church and to certain other named denominations.