"Heavy" is a song by American rock band Linkin Park, featuring guest vocals from American pop singer and songwriter Kiiara. The song is the first single from their seventh studio album, One More Light. The song was written by Linkin Park members Chester Bennington, Brad Delson, and Mike Shinoda, alongside Julia Michaels and Justin Tranter. The single was released for download on February 16, 2017, and was premiered on radio on February 21.

Band members Chester Bennington, Mike Shinoda, and Brad Delson worked with Julia Michaels and Justin Tranter in co-writing the song's lyrics, who had previously worked with artists such as Justin Bieber, Selena Gomez, and Gwen Stefani. Lyrically, the inspiration for "Heavy" came from band member's conversations about frustrations and troubles in their own lives. From that, they found that there was some heavy stuff happening in each other's lives. Bennington stated that personally, he has a hard time with life, even on a good day. He said the opening line "I don't like my mind right now" is him 24 hours a day.

In a series of videos released leading up to the single's debut, Joseph Hahn brought up the idea of bringing in a female singer for the track, which he described as "something that feels out of the box for us, could give [the song] that dynamic it needs." Bennington, in working with Michaels on writing the track and hearing her rough vocal takes, suggested she sing on the final version, though she declined, stating she would rather be behind the scenes. Bennington recorded a version entirely with his vocals in case the band could not find a fit for a female singer, while the band continued their search.

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