Australia in the Eurovision Song Contest 2021

Australia participated in the Eurovision Song Contest 2021 with the song "Technicolour" written by Montaigne and Dave Hammer. The song was performed by Montaigne, who was internally selected by the Australian broadcaster Special Broadcasting Service (SBS) to represent that nation at the 2021 contest in Rotterdam, Netherlands. Montaigne was announced as the Australian representative on 2 April 2020 after they were due to compete in the 2020 contest with "Don't Break Me" before the 2020 event's cancellation. The song Montaigne performed, "Technicolour", was presented to the public on 4 March 2021.

Australia debuted in the Eurovision Song Contest in 2015 by invitation from the European Broadcasting Union (EBU) as a "one-off" special guest to celebrate the 60th anniversary of Eurovision. On 17 November 2015, the EBU announced that SBS had been invited to participate in the 2016 contest and that Australia would once again take part. In 2015, Australia was guaranteed a spot in the final of the contest and was allowed to vote during both semi-finals and the final; however, from the 2016 contest and onwards, Australia would have to qualify to the final from one of two semi-finals and could only vote in the semi-final in which the nation was allocated to compete.

Australia was drawn to compete in the first semi-final of the Eurovision Song Contest which took place on 18 May 2021. Performing during the show in position 5, "Technicolour" was not announced among the top 10 entries of the first semi-final and therefore did not qualify to compete in the final, making it the first time that Australia failed to qualify to the final of the Eurovision Song Contest from a semi-final since their debut in 2015.