"Machine Gun" is a song written by American musician Jimi Hendrix, and originally recorded by Band of Gypsys for their self-titled live album (1970). It is a lengthy, loosely defined (jam-based) protest of the Vietnam War, and perhaps a broader comment on conflict of any kind. Although a proper studio recording was never released, there are several other live recordings on album, including Live at Berkeley, Blue Wild Angel: Live at the Isle of Wight, and Voodoo Child: The Jimi Hendrix Collection.

The Band of Gypsys performance is often lauded as Hendrix's finest, and is widely considered a particularly fine electric guitar performance. The Band of Gypsys version of "Machine Gun" is roughly 12 minutes long. Hendrix's long guitar solos and percussive riffs combine with controlled feedback to simulate the sounds of a battlefield, such as helicopters, dropping bombs, explosions, machine guns, and the screams and cries of those wounded or grieving.

"Machine Gun" debuted in September 1969 with a performance by Hendrix and his bandmates at that time, drummer Mitch Mitchell and bassist Billy Cox. The song was broadcast on The Dick Cavett Show the week of September 5. Most known performances are between ten and twenty minutes long, varying somewhat in their lyrics. The improvisatory material revolves around a core descending riff and bassline: the song opens with a Uni-Vibe-based guitar riff intended to mimic the sound of a firing machine gun. The bass and drum patterns then commence. The rather sparse lyrics, which differ in every performance, relate the point of view of a soldier fighting in war:

Machine gun, tearin' my body all apart
Evil man make me kill you, evil man make you kill me
Evil man make me kill you, even though we're only families apart
Well, I pick up my axe and fight like a farmer
But your bullets still knock me down to the ground

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