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.