Siege was an American hardcore punk band from Weymouth, Massachusetts. Formed in 1981, they were active in the Boston hardcore scene from 1984 to 1985, and reunited briefly in 1991.

Siege's form of intense hardcore paired extremely fast tempos with vocalist Kevin Mahoney's screeches and growls. Though little known during its short existence, the band became posthumously revered by punk and heavy metal fans worldwide and is regarded as one of the pioneers of the grindcore and powerviolence sub-genres. Subsequent musicians have cited the group as a major influence, including the British grindcore band Napalm Death and the American thrashcore band Dropdead, whose name was taken from the title of Siege's initial demo.