A referendum was held in the Republic of Ireland on 7 December 1972 in an attempt to make two amendments to the Constitution of Ireland. Both measures were approved.

Fourth amendment

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

Electorate	Spoilt votes	Total poll (%)	For (%)	Against (%)
1,783,604	47,089	903,439 (50.7)	724,836 (84.6)	131,514 (15.4)

Fifth amendment

The Fifth Amendment to the constitution removed reference to "special position" of the Roman Catholic Church and to certain other named denominations.

Electorate	Spoilt votes	Total poll (%)	For (%)	Against (%)
1,783,604	49,326	903,659 (50.7)	721,003 (84.4)	133,430 (15.6)

See also

• Constitutional amendment
• Politics of the Republic of Ireland
• History of the Republic of Ireland