The Constitution Alteration (Simultaneous Elections) Bill 1974,[1] was an unsuccessful proposal to alter the Australian Constitution to require simultaneous elections for the House of Representatives and the Senate.

Previous elections to the House of Representatives and the Senate had usually held simultaneously although this was a matter of convention rather than constitutional law.

The bill to amend the constitution was passed by the House of Representatives however it was rejected by the Senate.

[1] Instead the referendum was put to voters using the deadlock provision in Section 128.

The proposal was to alter the constitution as follows (removed text stricken through; substituted text in bold):[1] This was the first unsuccessful referendum that sought to enable simultaneous elections of the House of Representatives and the Senate.