Bulgaria will participate in the Eurovision Song Contest 2018. Equinox were internally selected by the Bulgarian broadcaster Bulgarian National Television (BNT) on 12 March 2018 to perform the song “Bones” that will represent the nation at the 2018 contest in Lisbon, Portugal.

Prior to the 2018 contest, Bulgaria had participated in the Eurovision Song Contest eleven times since its first entry in 2005. The nation achieved their best result in the contest in 2017 with the song "Beautiful Mess" performed by Kristian Kostov, which placed second. To this point, together with their 2007 and 2016 entries 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 contest 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.

BNT will organise an internal selection process in order to select Bulgaria's entry for the Eurovision Song Contest 2018. The selected entry will be announced on 12 March 2018.

Producers, artists and songwriters were able to submit their entries from 14 November 2017 to 29 December 2017. BNT received a record number of 202 songs, and BNT determined there were thirteen "workable projects". On 30 December 2017, BTN revealed the song titles of the thirteen projects that would compete to be selected:

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