Greece participated in the Eurovision Song Contest 2009 with the song "This Is Our Night" sung by Sakis Rouvas. The Greek national television broadcaster Ellinikí Radiofonía Tileórasi (ERT) announced that it had internally selected Rouvas to represent Greece in the Eurovision Song Contest on July 15, 2008, making Greece the first country to pick an artist for the 2009 edition.

After choosing the artist, ERT set up a national final held on February 18, 2009 to select the song. Rouvas sang three candidate songs, all with music written by Dimitris Kontopoulos, and "This Is Our Night" was declared the winner, gaining a large majority of the votes. Following the selection of the song, Rouvas began a promotional tour around Europe and appeared on many shows, including the selections for other countries participating in the Contest.

At the second semi-final of the Contest on May 14, Greece qualified for the final after coming in fourth place with 110 points. At the May 16 final, Rouvas presented "This Is Our Night" eighth out of 25 and at the end of voting, was awarded seventh place, marking Greece's sixth consecutive top 10 placing since 2004.

Prior to the 2009 Contest, Greece had participated in the Eurovision Song Contest twenty-nine times since its first entry in 1974, winning it in 2005 with the song "My Number One" performed by Elena Paparizou, and being placed third three times: in 2001 with the song "Die for You" performed by the duo Antique; in 2004 with "Shake It" performed by Sakis Rouvas; and the 2008 entry "Secret Combination" performed by Kalomoira. Following the introduction of the semi-finals for the 2004 contest, Greece has had a top ten placing each year. Greece's least successful result was in 1998 when it placed twentieth with the song "Mia Krifi Evesthisia" by Thalassa, receiving only twelve points in total, all from Cyprus.

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