"Who Do You Love" is a song by American DJ duo the Chainsmokers featuring Australian pop rock band 5 Seconds of Summer, released on February 7, 2019, through Sony Music. It is the acts' first collaboration and follows their December 2018 singles "Hope" and "Lie to Me", respectively. The song serves as the lead single from the Chainsmokers' third studio album World War Joy, alongside the scene of "Booksmart". The music video was released on March 25, 2019. In April 2021, an early demo of the song intended for Demi Lovato's 2017 album Tell Me You Love Me surfaced online.