"Believer" is a song by American rock band Imagine Dragons. The song was released on February 1, 2017 through Interscope and Kidinakorner as the lead single from the band's third studio album, Evolve.

"Believer" peaked at number four on the US Billboard Hot 100, becoming the band's third top ten hit after "Radioactive" and "Demons". The song played heavily on advertisements such for the Nintendo Switch and various movie trailers and television shows. It became the fifth best-selling song of 2017 in the United States.

In November 2016, Dan Reynolds told People that the song was inspired by his experiences with ankylosing spondylitis in 2015. He said that, "The meaning of the song is really reflecting on specific things in my life that were painful, whether it was anxiety and dealing with crowds, feeling overwhelmed by that or the success of the band, disease, going through depression—anything that was a source of pain in my life. And just rising above that, finding a place of perspective where I could be appreciative of the pain in my life and make it my greatest strength."

The music video was released on March 7, 2017 and features a boxing match between Dan Reynolds and Dolph Lundgren. It was directed by Matt Eastin and it features what seems to be a young Dan drawing on his notepad in scenes. It is obvious that Dan is losing, and he says that he wants to stop, with Dolph replying, "We can't," making it sound like they are forced to fight by a higher authority. It ends with Lundgren barely conscious, and we get to see what young Dan sketched: a symbol identical to the one on Lundgren’s chest, the “Evolve” symbol.

"Believer" reached number four on the Billboard Hot 100, and topped the Billboard Hot Rock Songs (29 weeks so far), Alternative Songs (13 weeks so far), and Adult Pop Songs (6 weeks). Among component charts, it also topped Rock Airplay, Rock Streaming Songs, Rock Digital Sale Songs, and Top TV Commercials Charts. It also topped the Canada Alternative Rock Chart. "Believer" broke the 14-year-old record for the most spins on the Mediabase Alternative chart. "Believer" has reached the top ten in Austria, Canada, Czech Republic, France, Hungary, Italy, Poland, Portugal, Slovakia, Switzerland, and the United States.

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