"Elastic Heart" is a song by Australian singer Sia, featuring Canadian singer The Weeknd and American record producer Diplo, taken from the soundtrack for the 2013 American film The Hunger Games: Catching Fire. Andrew Swanson assisted the artists in writing the song, with production handled by Diplo and American producer Greg Kurstin. It was released on 1 October 2013 as a single from Catching Fire by RCA, Republic and Lionsgate. "Elastic Heart" peaked at number 7 on the singles chart of New Zealand and was certified gold by the Recorded Music NZ. It also appeared on the charts of Australia, Belgium, Switzerland and the United Kingdom.

In 2014, Sia re-recorded a solo version of "Elastic Heart" for her sixth studio album 1000 Forms of Fear. The solo version was released in 2015 as a single from the album and was accompanied by a controversial music video that features actor Shia LaBeouf and dancer Maddie Ziegler. The clip was the eighth most viewed YouTube music video in 2015, while the single peaked within the top 10 in Australia and the United Kingdom, and the top 20 in the United States.

"Elastic Heart" was released as the second single from the soundtrack for The Hunger Games: Catching Fire (2013). The song was made available for digital download on 1 October 2013. It was sent to US rhythmic contemporary radio by RCA Records, Republic Records and Lionsgate Films on 8 October 2013.

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