"It Will Rain" is a song recorded by American singer and songwriter Bruno Mars. It was released on September 27, 2011, exclusively on iTunes, by Atlantic Records as the lead single from the soundtrack of the film, The Twilight Saga: Breaking Dawn – Part 1. Mars composed the song with his production team The Smeezingtons, and it was partially written during the The Doo-Wops & Hooligans Tour in the United States, being finished after the singer watched an early version of the movie which inspired him. The soundtrack for The Twilight Saga: Breaking Dawn – Part 1 was a much expected release and Mars' song was chosen as the lead single by the album's executive producer, Alexandra Patsavas, to promote it. Musically, "It Will Rain" is a pop, pop-soul and soft rock ballad. Its lyrics tell the agony and torment of a heartbreak and its various stages.

The song received mixed feedback from music critics who praised the vocals, but criticized the over-dramatization of the song. It drew comparisons to Mars' single, "Grenade" (2010), and to "Wild Horses" (1971) by The Rolling Stones. It was commercially successful reaching the top of the charts in the Mainstream Top 40 of the United States, South Korea International Singles and Venezuela Pop/Rock General, number two in New Zealand and top-five in many markets. It reached number three on the Billboard Hot 100 and number five on the Canadian Hot 100. It was certified three times platinum by the Recording Industry Association of America (RIAA) and by Music Canada (MC).

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