Imagine Dragons are an American pop rock band formed in 2008, based in Las Vegas, Nevada, and currently consisting of lead singer Dan Reynolds, guitarist Wayne Sermon, and bassist Ben McKee. The band first gained exposure with the release of their single "It's Time", followed by their debut album Night Visions (2012), which resulted in the chart-topping singles "Radioactive" and "Demons". Rolling Stone named "Radioactive", which held the record for most weeks charted on the Billboard Hot 100, the "biggest rock hit of the year". MTV called them "the year's biggest breakout band", and Billboard named them their "Breakthrough Band of 2013" and "Biggest Band of 2017", and placed them at the top of their "Year in Rock" rankings for 2013, 2017, and 2018. Imagine Dragons topped the Billboard Year-End "Top Artists – Duo/Group" category in 2018.

The band's second studio album Smoke + Mirrors (2015) reached number one in the US, Canada and the UK. This was followed by their third studio album Evolve (2017), which resulted in three chart-topping singles, "Believer", "Thunder", and "Whatever It Takes", also making them the artist with the most weeks at number one on the Billboard Hot Rock Songs chart. The album reached the top five in many countries. The band's fourth studio album Origins (2018) featured the single "Natural", which became their fifth song to top the Hot Rock Songs chart. The band has since released Mercury – Acts 1 & 2 (2022), a double album featuring the US top 5 hit "Enemy", and Loom (2024), their first album without longtime drummer Daniel Platzman. Despite their popularity and commercial success, the band's music has been consistently met with mixed critical reception.

Imagine Dragons have won three American Music Awards, nine Billboard Music Awards, one Grammy Award, one MTV Video Music Award, and one World Music Award. In May 2014, the band was nominated for 14 Billboard Music Awards, including Top Artist of the Year and a Milestone Award, which recognizes innovation and creativity of artists across different genres. In April 2018, the band was nominated 11 more times for Billboard Music Awards.

Imagine Dragons have sold more than 74 million albums and 65 million digital songs worldwide, making them one of the world's best-selling music artists. They have also earned 160 billion streams across music platforms. They were the most streamed group of 2018 on Spotify, the first rock act to have four songs, "Radioactive", "Demons", "Believer", and "Thunder", to surpass one billion streams each, and the only group in RIAA history to have four songs certified higher than Diamond. According to Billboard, "Believer", "Thunder", and "Radioactive" were the three best performing rock songs of the 2010s.