"Bad Guy" (stylized in all lowercase) is a song by American singer-songwriter Billie Eilish and the fifth single from her debut studio album, "When We All Fall Asleep, Where Do We Go?" (2019). It was released on 29 March 2019 by Darkroom and Interscope Records. The song was written by Eilish and her brother Finneas O'Connell, who also produced the track, with additional production by Eilish. A version of the song featuring Canadian singer Justin Bieber was released on 11 July 2019.

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