Portugal participated in the Eurovision Song Contest 2015 with the song "Há um mar que nos separa", written by Miguel Gameiro. The song was performed by Leonor Andrade. The Portuguese broadcaster Rádio e Televisão de Portugal (RTP) organised the national final Festival da Canção 2015 in order to select the Portuguese entry for the 2015 contest in Vienna, Austria. After 12 songs competed through two semi-finals and a final, "Há um mar que nos separa" performed by Leonor Andrade emerged as the winner, ultimately being selected through a public televote. In the second of the Eurovision semi-finals, Portugal failed to qualify to the final, placing fourteenth out of the 17 participating countries with 19 points.

Prior to the 2015 Contest, Portugal had participated in the Eurovision Song Contest forty-seven times since its first entry in 1964. Its highest placing in the contest, to this point, has been sixth place, which the nation achieved in 1996 with the song "O meu coração não tem cor" performed by Lúcia Moniz. To this point, Portugal has been competing in the contest the longest time without having achieved victory. Since semi-finals were introduced into the contest in 2004, Portugal has failed to reach the final seven times. After failing to qualify to the final in 2012, the country briefly withdrew from the contest in 2013. Portugal returned in 2014 with Suzy performing the song "Quero ser tua", which also failed to qualify the nation the final.

The Portuguese broadcaster for the 2015 Contest, who broadcasts the event in Portugal and organises the selection process for its entry, was Rádio e Televisão de Portugal (RTP). Portugal has most commonly selected their entry through the national final Festival da Canção except between 2003 and 2005 where the broadcaster used internal selections and the talent competition Operação triunfo to select their entry. The broadcaster will organize the 2015 edition of Festival da Canção in order to select the Portuguese entry for the 2015 Eurovision Song Contest.

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