State elections were held in South Australia on 17 September 1977. All 47 seats in the South Australian House of Assembly were up for election. The incumbent Australian Labor Party led by Premier of South Australia Don Dunstan won a fourth term in government, defeating the Liberal Party of Australia led by Leader of the Opposition David Tonkin.

Quick Facts All 47 seats in the South Australian House of Assembly 24 seats were needed for a majority, First party ...

1977 South Australian state election

← 1975 17 September 1977 (1977-09-17) 1979 →
All 47 seats in the South Australian House of Assembly 24 seats were needed for a majority
First party Second party   Leader Don Dunstan David Tonkin Party Labor Liberal Leader since 1 June 1967 24 July 1975 Leader's seat Norwood Bragg Seats before 23 21 Seats won 27 17 Seat change 4 4 Popular vote 383,831 306,356 Percentage 51.64% 41.21% Swing 5.31 9.68 TPP 53.40% 46.60% TPP swing 4.20 4.20   Third party Fourth party   DEM NAT Leader Robin Millhouse Peter Blacker Party Democrats National Leader's seat Mitcham Flinders Seats before 0 1 Seats won 1 1 Seat change 1 Popular vote 25,855 11,825 Percentage 3.48% 1.59% Swing New 1.18
Premier before election Don Dunstan Labor Elected Premier Don Dunstan Labor

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Parliamentary elections for the lower house of the Parliament of South Australia were held in South Australia in 1977. There was no election for Legislative Council; and as of 2020, this is the most recent South Australian election which has not been for both houses.

The Labor Party led by Don Dunstan, which had won the previous three elections in 1970, 1973 and 1975, defeated the Liberal Party of Australia opposition led by David Tonkin. It was the first time that a Labor government in South Australia had been re-elected for a fourth term, and would be the first nine-year-incumbent Labor government. This would be Dunstan's last election before resigning due to ill health in 1979.

This was the first election after the end of Playmander seat weighting where one vote one value was introduced. At the previous election some metropolitan seats still saw more than three times the number of voters than in some rural seats, despite most of the Playmander being abolished nearly a decade ago. The redistribution was the reason Dunstan called an early election.^[1]

The Australian Democrats ran for the first time under a joint New LM-Australian Democrats ticket, winning an average 12.3 percent of the primary vote in the 12 electorates they contested, with former LCL MP Robin Millhouse retaining his seat of Mitcham, which he would hold until 1982.

• Issue of writ: 25 August 1977
• Close of nominations: 2 September 1977
• Polling day: 19 September 1977
• Return of writ: On or before 3 October 1977

Keith Russack stood as an Independent Liberal, but later joined the Liberal Party; giving the numbers: 27 Labor, 18 Liberal, 1 Country Party, 1 Australian Democrat.

A 1979 Norwood by-election was triggered as a result of Dunstan's resignation. Labor retained the seat on a considerably reduced majority.

This table lists changes in party representation at the 1977 election.

• Members listed in italics did not recontest this election.
• Keith Russack was the sitting Liberal member for the abolished district of Gouger. He was not pre-selected for any seat in the redistribution, so he quit the party and ran as an Independent candidate for the seat of Goyder.
• David Boundy was elected as a Liberal Movement member for Goyder, but joined the Liberal party in 1976. He was defeated by Keith Russack, who re-joined the Liberal party after being elected.
• Sitting Liberal MP for the abolished district of Heysen, David Wotton was preselected for the district of Murray over incumbent MP Ivon Wardle. Wardle contested the election as an Independent, but was defeated by Wotton.
• Robin Millhouse was elected in 1975 as Liberal Movement member for Mitcham. He joined the Democrats in 1977 and won a second term to his seat.
• Ted Connelly was elected as an Independent MP for the abolished district of Pirie in 1975, but later joined the Labor party. He contested the seat of Rocky River and lost.
• Sitting Labor MP for the abolished seat of Tea Tree Gully, Molly Byrne instead contested the new seat of Todd and won.

• Results of the South Australian state election, 1977 (House of Assembly)
• Candidates of the 1977 South Australian state election
• Members of the South Australian House of Assembly, 1977-1979
• Members of the South Australian Legislative Council, 1975-1979