Relient K is an American rock band formed in 1998 in Canton, Ohio by Matt Thiessen (lead vocals, guitar, piano), Brian Pittman (bass), and Matthew Hoopes (guitar, backing vocals), during the band’s junior year in high school and their time at Malone College. The band is named after guitarist Hoopes’ automobile, a Plymouth Reliant K car, with the spelling intentionally altered to avoid trademark infringement over the Reliant name.

In 2000, Dave Douglas replaced Stephen Cushman on drums.