"Sun of a Gun" is the major-label debut song recorded by Danish recording artist Oh Land. It is taken from her self-titled second studio album Oh Land (2011). It was released as the album's lead single on 4 October 2010 by Fake Diamond Records and Sony Music Entertainment. Elsewhere, the single was released on 24 April 2011 as a CD single and 7-inch single. A Europop and synthpop song, its lyrics describe a troubled relationship by comparing its effects to the orbit of the sun. The track was written by Jimmy Harry and Nanna Øland Fabricius, with Dave McCracken solely producing it.

"Sun of a Gun" received positive reviews from critics, who praised its "ready for the dancefloor" theme, in addition to it being a "standout track". In the United States, it garnered commercial success on the Dance Club Songs chart, spending a total of nine weeks on the chart. It also peaked in several European countries, including in Austria, Belgium, Denmark, and Germany. An accompanying music video premiered on 19 October 2010, displaying Oh Land in two different themes of a relationship. It was filmed in Brooklyn and directed by ThirtyTwo. Oh Land performed the song on various occasions, including on an episode of Jimmy Kimmel Live! in March 2011.

"Sun of a Gun" is a synthpop and Europop song that lasts three minutes and twenty-five seconds. It is composed in the key of E minor using common time with a tempo of 133 beats per minute. It was written by Jimmy Harry and Nanna Øland Fabricius, while Dave McCracken served as the song's executive producer. The song was written while Oh Land was in Los Angeles. Lyrically, the song depicts a relationship by comparing it to the earth's orbit. In an interview with MTV News, Oh Land described its lyrics: "It's a love story about being in a relationship with a person who's kind of destructive, but you keep coming back because you can't let it go". She further confirmed "that it was also a metaphor for how we orbit around the sun". The singer ended with: "The sun is a really beautiful thing: a sunset, a sunrise is spectacular. But it's also something we need to protect ourselves against, because it can burn you and it can be dangerous."

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