2024 Dunstan state by-election

A by-election for the seat of Dunstan in the South Australian House of Assembly was held on 23 March 2024, following the resignation of incumbent member and former Premier Steven Marshall, which was announced on 24 January 2024.

Labor candidate Cressida O'Hanlon was elected the new member, defeating Liberal candidate Anna Finizio. O'Hanlon is the first Labor member to represent the seat, and the only member other than Marshall to have represented the seat since its creation in 2014. It is the first instance of a governing party gaining a seat in a by-election from the Opposition in South Australia in over a century.

Background
The by-election was triggered by the resignation of sitting Liberal MP and former Premier Steven Marshall.

Dunstan is considered an ultra-marginal seat, sitting on a 0.5% margin. Indeed, at the 2022 state election, when Marshall's Liberal government unsuccessfully sought a second term (but were defeated in a landslide), Marshall came close to losing his own seat.

Candidates
List of candidates as they appear on the ballot order.
 * Frankie Bray (Animal Justice Party)
 * Cressida O'Hanlon (Labor)
 * Katie McCusker (Greens)
 * Anna Finizio (Liberal)
 * Nicole Hussey (Australian Family Party)