Greece in the Eurovision Song Contest 2005

Greece was represented at the Eurovision Song Contest 2005 with the song "My Number One", written by Christos Dantis, Natalia Germanou, and Manos Psaltakis, and performed by Helena Paparizou. The Greek participating broadcaster, Hellenic Broadcasting Corporation (ERT), selected its entry through a national final, after having previously selected the performer internally. "My Number One" was selected on 2 March 2005, where the public and a professional jury chose it over three other candidate songs. The entry eventually won the Eurovision Song Contest with 230 points, marking Greece's first ever victory at the contest.

To promote the entry, Paparizou made appearances in Andorra, Germany, Malta, Serbia and Montenegro, Portugal, Russia, Sweden, Turkey, and Ukraine, performing the song and meeting with local media. Greece was prequalified for the 2005 contest final, having placed third at the prior year's contest. At the 21 May final, Paparizou performed "My Number One" 19th out of the 24 participants and at the end of voting, the entry was awarded first place.