"Bird Set Free" is a song recorded by Sia for her seventh studio album This Is Acting (2016).

In an interview with Rolling Stone, Sia said that the song was written for Pitch Perfect 2 soundtrack, but they rejected it in favour of "Flashlight".

[8] In a review of the song's parent album This Is Acting, Kathy Iandolf of Idolator wrote "This album is dark, indicated by the lead single 'Alive,' but also by the opener 'Bird Set Free,' where Sia takes a solemn vow to emotional liberation amidst strong piano keys.

"[10] Calling the song a "ginormo self-empowerment anthem", Hugh Montgomory of The Independent wrote "Sia produces something more complex, battle-cries from a volatile soul.

"[11] Sia performed "Bird Set Free" and "Alive" on the 7 November 2015 episode of Saturday Night Live.