A by-election for the Australian House of Representatives seat of Braddon took place on Saturday 28 July 2018, following the resignation of incumbent Labor MP Justine Keay. 
In early counting, within an hour of the close of polls, the Australian Broadcasting Corporation's psephologist Antony Green's electoral computer had predicted Labor to retain the electorate.
The by-election occurred on the same day as four other by-elections for the House of Representatives, colloquially known as Super Saturday.
Background.
Due to the High Court ruling against Senator Katy Gallagher on 9 May 2018 as part of the ongoing parliamentary eligibility crisis, Keay and three other MPs in the same situation announced their parliamentary resignations later that day, while the Perth incumbent resigned for family reasons. The Speaker announced on 24 May 2018 that he had scheduled the by-elections to occur on 28 July 2018. Popularly labelled "Super Saturday", the occurrence of five simultaneous federal by-elections is unprecedented in Australian political history. The others are:
A redistribution of the Tasmanian federal electoral divisions was completed in 2017, however by-elections are conducted under existing boundaries, as redistributed boundaries do not come into effect until the subsequent federal election.
Key dates.
Key dates in relation to the by-election are:
Results.
! scope="col" colspan="2" style="width: 130px"|Party
! scope="col" style="width: 17em"|Candidate
! scope="col" style="width: 5em"|Votes
! scope="col" style="width: 3.5em"|%
! scope="col" style="width: 3.5em"| ;templatestyles src="Template:Tooltip/styles.css" / ;±%
! colspan="3" style="text-align:right;" | Total formal votes
! colspan="3" style="text-align:right;" | Informal votes
! colspan="3" style="text-align: right; margin-right: 0.5em" scope=row | Turnout
! colspan="6" style="text-align:left;" |Two-party-preferred result
References.
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