Portugal participated in the Eurovision Song Contest 2009 with the song "Todas as ruas do amor" written by Pedro Marques and Paulo Pereira. The song was performed by the group Flor-de-Lis. The Portuguese broadcaster Rádio e Televisão de Portugal (RTP) organised the national final Festival da Canção 2009 in order to select the Portuguese entry for the 2009 contest in Moscow, Russia. The competition took place on 28 February 2009 where "Todas as ruas do amor" performed by Flor-de-Lis emerged as the winner after achieving the highest score following the combination of votes from twenty regional juries and a public televote.

The Eurovision Song Contest 2009 was the 54th edition of the Eurovision Song Contest. It took place in Moscow, Russia, following the country's victory at the 2008 contest with the song "Believe" by Dima Bilan. Organised by the European Broadcasting Union (EBU) and host broadcaster Channel One (C1R), the contest was held at the Olimpiysky Arena, and consisted of two semi-finals on 12 and 14 May, and a final on 16 May 2009. The semi-finals were presented by Russian model Natalia Vodianova and television presenter Andrey Malakhov, while the final was presented by Russian television presenter Ivan Urgant and former Russian contestant Alsou Abramova, becoming the first and to date only time that two different sets of presenters had hosted the semi-finals and finals.