21 Guns (song)

"21 Guns"
Single by Green Day
from the album 21st Century Breakdown
B-side	"Favorite Son"
Released	May 25, 2009 (digital download) July 14, 2009 (CD single)
Genre	Arena rock pop punk power pop
Length	5:21
Label	Reprise
Composer(s)	Green Day David Bowie
Lyricist(s)	Billie Joe Armstrong
Producer(s)	Butch Vig Green Day
Green Day singles chronology
"Know Your Enemy" (2009) "21 Guns" (2009) "East Jesus Nowhere" (2009)
Music video
"21 Guns" on YouTube

"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 25, 2009 as a 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 and is featured as one of the songs during the end credits.

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