2018 South Australian state election

2018 South Australian state election

← 2014 17 March 2018 2022 →
All 47 seats in the South Australian House of Assembly 24 seats were needed for a majority 11 (of the 22) seats in the South Australian Legislative Council
First party Second party Third party   Leader Steven Marshall Jay Weatherill Nick Xenophon Party Liberal Labor SA-Best Leader since 4 February 2013 21 October 2011 4 July 2017 Leader's seat Dunstan Cheltenham None (contested Hartley) Last election 22 seats 23 seats Did not exist Seats won 25 19 0 seats Seat change 3 4 Popular vote 398,182 343,896 148,360 Percentage 37.97% 32.79% 14.15% Swing 6.81 3.01 14.15 TPP 51.94% 48.06% TPP swing 1.07 1.07
Results by electoral division by first preference vote and two-party-preferred vote Results by electoral division, showing seats gained and held by each party
Premier before election Jay Weatherill Labor Elected Premier Steven Marshall Liberal

The 2018 South Australian state election to elect members to the 54th Parliament of South Australia was held on 17 March 2018. All 47 seats in the House of Assembly or lower house, whose members were elected at the 2014 election, and 11 of 22 seats in the Legislative Council or upper house, last filled at the 2010 election, were contested. The record-16-year-incumbent Australian Labor Party (SA) government led by Premier Jay Weatherill was seeking a fifth four-year term, but was defeated by the opposition Liberal Party of Australia (SA), led by Opposition Leader Steven Marshall. Nick Xenophon's new SA Best party unsuccessfully sought to obtain the balance of power.

Like federal elections, South Australia has compulsory voting, uses full-preference instant-runoff voting for single-member electorates in the lower house and optional preference single transferable voting in the proportionally represented upper house. The election was conducted by the Electoral Commission of South Australia (ECSA), an independent body answerable to Parliament.