Bulgaria participated in the Eurovision Song Contest 2017 with the song "Beautiful Mess" written by Borislav Milanov, Sebastian Arman, Joacim Bo Persson, Alex Omar and Alexander V. Blay. The song was performed by Russian-Bulgarian singer Kristian Kostov. On 19 February 2016, the Bulgarian broadcaster Bulgarian National Television (BNT) announced that Kristian Kostov had been internally selected to compete at the 2017 contest in Kiev, Ukraine. The song that Kostov competed with, "Beautiful Mess", was also internally selected and was presented to the public on 13 March 2017.

Prior to the 2017 contest, Bulgaria had participated in the Eurovision Song Contest ten times since its first entry in 2005. The nation achieved their best result in the contest in 2016 with the song "If Love Was a Crime" performed by Poli Genova, which placed fourth. To this point, together with their 2007 entry it is the only Bulgarian entry to have qualified to the Eurovision final; the nation had failed to qualify to the final with their other eight entries.

The Bulgarian national broadcaster, Bulgarian National Television (BNT), broadcasts the event within Bulgaria and organises the selection process for the nation's entry. In the past, BNT had alternated between both internal selections and national finals in order to select the Bulgarian entry. After consistently being present for every contest since their debut in 2005, the Bulgarian broadcaster announced in November 2013 that the country would not participate in the 2014 citing an expensive participation fee and limited funds due to budget cuts as reasons for their decision. Limited finances also prevented the broadcaster from returning in 2015. After a two-year absence, BNT confirmed Bulgaria's return at the Eurovision Song Contest 2016.

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