2018 South Australian state election

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.

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
Leader Steven Marshall Jay Weatherill
Party Liberal Labor
Leader since 4 February 2013 21 October 2011
Leader's seat Dunstan Cheltenham
Last election 22 seats 23 seats
Seats won 25 seats 19 seats
Seat change 3 4
Popular vote 398,182 343,896
Percentage 37.97% 32.79%
Swing 6.81 3.01
TPP 51.94% 48.06%
TPP swing 1.07 1.07

The map on the left shows the first party preference by electorate. The map on the right shows the final two-party preferred vote result by electorate.

Premier before election

Jay Weatherill

Elected Premier

Steven Marshall

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.