Cyprus participated in the Eurovision Song Contest 2015 with the song "One Thing I Should Have Done" written by Mike Connaris and Giannis Karagiannis and performed by Karagiannis. The Cypriot broadcaster Cyprus Broadcasting Corporation (CyBC) returned to the Eurovision Song Contest after a one-year absence following their withdrawal in 2014 due to financial and budget restrictions, and organised the national final Eurovision Song Project in order to select the Cypriot entry for the 2015 contest in Vienna, Austria. The national final featured 54 entries competing in a nine-week-long process, resulting in the selection of Karagiannis with "One Thing I Should Have Done" at the final on 1 February 2015, where six entries remained.

The Eurovision Song Contest 2015 was the 60th edition of the Eurovision Song Contest. It took place in Vienna, Austria, following the country's victory at the 2014 contest with the song "Rise Like a Phoenix" by Conchita Wurst. Organised by the European Broadcasting Union (EBU) and host broadcaster Österreichischer Rundfunk (ORF), the contest was held at the Hall D of the Wiener Stadthalle and consisted of two semi-finals on 19 and 21 May, and a final on 23 May 2015. The three live shows were presented by Austrian television presenters Mirjam Weichselbraun, Alice Tumler and Arabella Kiesbauer, while the previous edition's winner Conchita Wurst acted as the green room host.