Belarus participated in the Eurovision Song Contest 2009 with the song "Eyes That Never Lie" written by Petr Elfimov and Valery Prokhozhy. The song was performed by Petr Elfimov. The Belarusian entry for the 2009 contest in Moscow, Russia was selected through the national final Eurofest 2009, organised by the Belarusian broadcaster National State Television and Radio Company of the Republic of Belarus (BTRC). The national final was a televised production which consisted of a semi-final and a final held on 15 December 2008 and 19 January 2009, respectively. Fifteen competing acts participated in the semi-final where the top five entries as determined by a jury panel qualified to the final. In the final, public televoting selected "Eyes That Never Lie" performed by Petr Elfimov as the winner with 11,475 votes.

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.