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Two referendums were held in the Ireland on 16 October 1968, each on a proposed amendment of the Irish constitution relating to the electoral system. Both proposals were rejected.

Third amendment bill

Main article: Third Amendment of the Constitution Bill 1968

The Third Amendment of the Constitution of Ireland Bill 1968 define the apportionment of constituency boundaries in a manner which would have allowed a greater degree of divergence of the ration between population and constituencies.

Third Amendment of the Constitution of Ireland Bill 1968
Choice Votes %
No
656,803 60.76
Yes 424,185 39.24
Valid votes 1,080,988 95.71
Invalid or blank votes 48,489 4.29
Total votes 1,129,477 100.00
Registered voters and turnout 1,717,389 65.77

Fourth amendment bill

Main article: Fourth Amendment of the Constitution Bill 1968

The Fourth Amendment of the Constitution of Ireland Bill 1968 proposed to alter the electoral system for elections to Dáil Éireann from proportional representation by means of the Single transferable vote to the First-past-the-post voting system.

Fourth Amendment of the Constitution of Ireland Bill 1968
Choice Votes %
No
657,898 60.84
Yes 423,496 39.16
Valid votes 1,081,394 95.73
Invalid or blank votes 48,212 4.27
Total votes 1,129,606 100.00
Registered voters and turnout 1,717,389 65.77

See also