Protomartyr is an American rock band formed in 2008 in Detroit, Michigan, United States. It features Joe Casey on vocals, Greg Ahee on guitar, Alex Leonard on drums and Scott Davidson on bass guitar.

Prior to Protomartyr, Greg Ahee and Alex Leonard were performing as a duo, which was named Butt Babies. They were soon joined by Joe Casey, who started to perform on vocals at Butt Babies shows. Kevin Boyer of Tyvek joined Protomartyr on bass and second guitar for a short time before leaving the act due to the working schedules with his other band. As Scott Davidson joined the band on bass, Butt Babies transformed into Protomartyr...

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