"Sudden Death" is a song by the American heavy metal band Megadeth. It was written by Dave Mustaine for inclusion in the 2010 music video game Guitar Hero: Warriors of Rock, which was released on September 28, 2010 in North America. The song itself was released as a single with cover art on iTunes on September 24, 2010, and on September 28, Roadrunner Records made the song available for streaming on its website.

It is Megadeth's first release with bassist Dave Ellefson since 2002, following his return to the band in 2010. The song was well received by critics and was described as one of the hardest songs in the Guitar Hero franchise. Roadrunner Records submitted the song to consideration for Best Metal Performance at the 53rd Grammy Awards. Several months later it was nominated, making it the band's second consecutive nomination, following "Head Crusher" in 2010, and band's ninth overall nomination in the category.

Although the song was not originally recorded for an album, it was later included as the opening track on the band's 2011 album, Thirteen, as a remixed version by Johnny K.

In early February 2010, it was reported that Megadeth was working on a yet unnamed secret song project. What the project was about or how it would be released was not known or announced at the time. Several weeks later, ultimately after much speculation, the project was reported to be a promotional recording by Megadeth frontman Dave Mustaine. In early March the song had its name announced: "Sudden Death", though some sites had mistakenly reported the song as "Sudden Deth". A few months later it was confirmed that the song was written exclusively for Guitar Hero: Warriors of Rock, and would be featured in an important part in the game. The Megadeth songs "Holy Wars... The Punishment Due" and "This Day We Fight!" were also set to be featured in the game. It was the first song Megadeth recorded with original bassist Dave Ellefson following the replacement of James LoMenzo in early 2010.

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