On 5 April 2014, an Australian Senate special election in Western Australia was held. The special election was held six months after the 2013 Australian federal election. The result of that 2013 election for the Australian Senate in Western Australia was voided on 20 February 2014 by the High Court of Australia, sitting as the Court of Disputed Returns, because 1,375 ballot papers were lost during an official recount in November 2013. The High Court ruled that because the number of lost ballots exceeded the margin for the two remaining Senate seats, the only acceptable remedy was to void the results and hold a special election.

The 2013 Australian federal election to elect the members of the 44th Parliament of Australia took place on 7 September 2013. The centre-right Liberal/National Coalition opposition led by Opposition leader Tony Abbott of the Liberal Party of Australia and Coalition partner the National Party of Australia, led by Warren Truss, defeated the incumbent centre-left Labor Party government of Prime Minister Kevin Rudd in a landslide. It was also the third time in history that a party won 90 or more seats at an Australian election. Labor had been in government for six years since being elected in the 2007 election. This election marked the end of the Rudd-Gillard-Rudd Labor government and the start of the 9 year long Abbott-Turnbull-Morrison Liberal-National Coalition government. Abbott was sworn in by the Governor-General, Quentin Bryce, as Australia's new Prime Minister on 18 September 2013, along with the Abbott Ministry. The 44th Parliament of Australia opened on 12 November 2013, with the members of the House of Representatives and territory senators sworn in. The state senators were sworn in by the next Governor-General Peter Cosgrove on 7 July 2014, with their six-year terms commencing on 1 July.