The 1977 Australian referendum was held on 21 May 1977. It contained four referendum questions and one non-binding plebiscite. To date, it is the most recent referendum to have been successful in Australia.
__NOTOC__
{| class="wikitable"
|+ Result
|-----
| | Question
! style="width:50px" | NSW
! style="width:50px" | Vic
! style="width:50px" | Qld
! style="width:50px" | SA
! style="width:50px" | WA
! style="width:50px" | Tas
! style="width:70px" align=center | States in favour
! style="width:70px" align=center | Voters in favour
! style="width:80px" | Result
|-----
|| (33) Simultaneous Elections
|
|
|
|
|
|
|
|
!
|-----
|| (34) Senate Casual Vacancies
|
|
|
|
|
|
|
|
!
|-----
|| (35) Referendums
|
|
|
|
|
|
|
|
!
|-----
|| (36) Retirement of Judges
|
|
|
|
|
|
|
|
!
|}
This referendum had a particularly strong "Yes" vote. All but one of the referendum questions were carried, and the only one not carried had a clear national majority, but was held back by not achieving a majority of the states. No referendum since then has been successful.