The July 2018 Australian federal by-elections, known colloquially as Super Saturday, were five by-elections held on 28 July 2018, to fill vacancies in the Australian House of Representatives caused by the resignations in May 2018 of five MPs.

[1] Three MPs of the Australian Labor Party and the Centre Alliance's sole MP resigned due to dual citizenship concerns after the High Court ruled on 8 May 2018 that Senator Katy Gallagher was ineligible to have been elected to the Australian Senate for being a dual citizen, in similar circumstances to four of the lower house MPs.

All sitting MPs apart from Hammond re-contested and won the ensuing by-elections.

[3] The governing Liberal/National Coalition did not contest the by-elections in the safe Labor seats of Fremantle and Perth, with the Liberal Party contesting the by-elections in the marginal Labor seats of Braddon and Longman, and the Centre Alliance-held Mayo.

Coalition performance at the by-elections was below expectations[4] and Malcolm Turnbull resigned as Prime Minister after losing a leadership spill less than a month later.