"Big Gun" is a song by AC/DC. It was released as a single in 1993 and can be heard on the soundtrack to the Arnold Schwarzenegger movie Last Action Hero, as well as during reruns of the Savage Nation talk show as bumper music. It was later released on the 2009 box set Backtracks. It became the band's first No. 1 on the Album Rock Tracks chart in 1993.

AC/DC has played the song live only once during 1996 rehearsals but never at an official show.

The music video, directed by David Mallet, begins with Schwarzenegger breaking an entrance door to an AC/DC concert. As he walks around the crowd and the stage, observing each band member, Angus kicks his cap towards him. When Schwarzenegger puts on the cap, his clothes morph into Angus' trademark school uniform costume and signature Gibson SG. He then starts imitating Angus' on-stage antics throughout the video, including a scene in which Angus Young actually climbs up on Schwarzennegger's back and rides around the stage perched on his shoulders while continuing to play his guitar chords. The video also features a young Shavo Odadjian, the future bassist for the Armenian-American alternative metal band System of a Down.

The video was similar to the one for "You Could Be Mine" (released to promote Terminator 2: Judgment Day), where Schwarzenegger interacted with Guns N' Roses.

The video was released on Family Jewels Disc 3, part of the 2009 box set Backtracks. It was not released on the original Family Jewels, because it contains scenes from the movie and therefore had licensing issues.

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