Slovenia in the Eurovision Song Contest 2003

Slovenia was represented at the Eurovision Song Contest 2003 with the song "Nanana", composed by Martin Štibernik, with lyrics by Karmen Stavec, and performed by Karmen herself. The Slovene participating broadcaster, Radiotelevizija Slovenija (RTVSLO), held the national final Evrovizijska Melodija 2003 in order to select its entry for the contest. Sixteen entries competed in the national final where the winner was selected over two rounds of voting. In the first round, the top three entries were selected following the combination of votes from a five-member jury panel and a public televote. In the second round, "Lep poletni dan" performed by Karmen Stavec was selected as the winner entirely by a public televote. The song was later translated from Slovene to English for Eurovision and was titled "Nanana".

Slovenia competed in the Eurovision Song Contest which took place on 24 May 2003. Performing as the closing entry during the show in position 26, Slovenia placed 23rd out of the 26 participating countries, scoring 7 points.