Fun is an American pop rock band based in New York City. The band consists of Jack Antonoff, Andrew Dost, and Nate Ruess.

Jack Michael Antonoff is an American singer, songwriter, and record producer. Antonoff is the lead vocalist of rock band Bleachers. He was previously the guitarist and drummer for the pop rock band fun and the lead vocalist for the indie rock band Steel Train. Aside from his work with the three groups, Antonoff has been prolific in songwriting and production for various music industry acts, including Taylor Swift, Sara Bareilles, the 1975, Lorde, St. Vincent, Florence and the Machine, Lana Del Rey, Fifth Harmony, Kevin Abstract, Carly Rae Jepsen, the Chicks, Tegan and Sara, and Clairo. Antonoff is credited with impact on the sound of contemporary popular music throughout the 2010s and 2020s.