Mischief Brew was an American folk punk band from Philadelphia consisting of vocalist and guitarist Erik Petersen, bassist Shawn St. Clair, and drummers Christopher Petersen and Christopher Kulp. The band played DIY folk punk and anarcho-punk music; it incorporated styles including American folk, Celtic folk, Gypsy-punk, and swing with lyrics influenced by the labour movement, protest music, and punk culture.

It was started by Erik Petersen as a solo project, but eventually grew into a band. Petersen drew inspiration from the protest movements of the 1960s, "the idea that rebellion in music didn't originate in punk rock" (Profane Existence No. 54, 2007), and anti-establishment artists like Woody Guthrie and Crass. Petersen's lyrics often pay homage to American labor radicalism of the early 20th century.

Mischief Brew has released albums and EPs on many different labels, notably Art of the Underground, Gunner Records, and Fistolo Records. In support of these records, Mischief Brew toured extensively throughout the United States as well as Europe. When playing live, they performed with four to five people, incorporating such instruments as junk/found percussion, trumpet, accordion, violin, mandolin, and vibraphone into their set.