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"21 Guns" is een nummer van de Amerikaanse punkgroep Green Day, geproduceerd door Butch Vig. Het werd als de tweede single van het achtste studioalbum 21st Century Breakdown uitgebracht en staat tevens op de soundtrack van de Transformers-film: Transformers: Revenge of the Fallen. Deze werd op 23 juni 2009 uitgebracht.

"21 Guns" is a song by American rock band Green Day. It was released as the second single from their eighth studio album, 21st Century Breakdown (2009), and serves as the sixteenth track from the album. The single was released through Reprise Records on May 26, 2009 on radio and digital download and July 14, 2009 as a CD single.

The song has been a commercial success on the Billboard Hot 100 chart, peaking at No. 22, becoming their highest charting single since "Wake Me Up When September Ends" in 2005. To date, it is their last top 40 hit in the United States. The song is also featured on the soundtrack of the film Transformers: Revenge of the Fallen, being one of the songs played during the end credits of the film.

It was nominated for a Grammy for Best Rock Performance by a Duo or Group with Vocal and Best Rock Song in 2010.