Australia participated in the Eurovision Song Contest 2015 in Vienna, Austria. Owing to its cultural and political ties to European countries, the Eurovision Song Contest has been televised in Australia by the public broadcaster SBS for over thirty years. In honour of the contest's 60th running and in recognition of the event's popularity in Australia, it was announced on 10 February 2015 that Australia was to be invited to compete in the 2015 contest as a special guest participant. Australians have participated in and even won Eurovision as representatives of other countries. In 2015 for example, the Australian coloratura soprano of Armenian descent Mary-Jean O'Doherty participated in the Eurovision Song Contest 2015 contest as part of the group Genealogy representing Armenia. But this marked the first time that the country has officially participated.

In March 2015, SBS announced that it had selected Guy Sebastian to represent Australia; he performed the song "Tonight Again" written by himself, David Ryan Harris and Louis Schoorl. Along with Austria, France, Germany, Italy, Spain and the United Kingdom, Australia was given an automatic entry into the grand final. The EBU has considered the possibility of similarly inviting other guest countries to future editions of the contest. However it was revealed in May 2015 that Australia might become a permanent participant following some reports by executive supervisor Jon Ola Sand to the Swedish broadcaster. In November 2015, the EBU announced that Australia would return in 2016.

Australia finished in fifth place in the final on 23 May, with a total of 196 points. In terms of individual votes, Sweden, Austria, Norway, the United Kingdom, Denmark, Iceland, Hungary, Switzerland, The Netherlands, Poland and San Marino all placed Australia in the top three. Host nation Austria and winner of the contest Sweden awarded 12 points to Australia.

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