"Do or Die" is a song by American rock band Thirty Seconds to Mars, featured on their fourth studio album Love, Lust, Faith and Dreams (2013). Written and produced by lead vocalist Jared Leto, "Do or Die" explores the feeling of standing up and living one's dreams using also ironic undertones. The song is styled in electronic rock and imbued with elements of arena rock. It was serviced to mainstream radio in July 2013 in Europe, and was released as a promotional single in the United States in March 2014. A version of the song remixed by Dutch music producer Afrojack was digitally released in March 2014 and later included on the deluxe edition of Afrojack's debut studio album Forget the World (2014).

"Do or Die" received positive reviews from music critics, who hailed its musical diversity and its euphoric but minimalistic nature. It charted in some nations due to digital sales from the parent album. The accompanying music video, directed by Leto, features live footage of Thirty Seconds to Mars onstage as well as stories from their fans, personally interviewed by Leto. The video garnered general acclaim from critics, who lauded its atmosphere and simplicity. The song was included in the setlist of the band's Love, Lust, Faith and Dreams Tour and the subsequent Carnivores Tour.

"Do or Die" was written and produced by Jared Leto. It was engineered by Jamie Reed Schefman and mixed by Serban Ghenea. John Hanes engineered it for mixing at Mixstar Studios in Virginia Beach, Virginia. The song was recorded at The International Centre for the Advancement of the Arts and Sciences of Sound in Los Angeles, California and mastered by Howie Weinberg and Dan Gerbarg at Howie Weinberg Mastering. Thirty Seconds to Mars unveiled six songs from their fourth studio album Love, Lust, Faith and Dreams, including "Do or Die", during a preview event held at the Electric Lady Studios in New York City on March 14, 2013.

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