"Armageddon It" is a song by the English hard rock band Def Leppard from their 1987 album Hysteria. It was released as a single in 1988 and went to No. 3 in the U.S. (their fourth U.S. Top Ten hit).

The vocal style of the song is described as "T.Rex meets Eddie Cochran with backing vocals", according to lead singer Joe Elliott in the liner notes for Vault: Def Leppard Greatest Hits (1980-1995).

The video for the song was the second to feature Def Leppard in a live arena setting. On 12–13 February 1988, the band recorded two shows at the McNichols Arena in Denver, Colorado for a future live film release. However, a month later, "Armageddon It" was set to be released as the sixth single off the popular Hysteria album and a promo video clip was urgently needed.

From the band's end, there was hesitation to film another concept video. Although they were happy with the results for "Hysteria" and "Animal", they were very unsatisfied with the way "Pour Some Sugar on Me" had turned out for its concept.

Therefore, an idea was pitched to quickly create a video edited from the Denver footage. It was another hit in the UK, reaching the Top 20. Months later, it was released in the United States and was even more successful, reaching the Top 3.

However, "Pour Some Sugar on Me" was the first song used there for the "live" concept (in fact, many of the scenes are the same in the two), but instead of filming a different video, slight changes were made using footage filmed in October at the Omni in Atlanta, Georgia.

There are two mixes of the song that appeared in the single: "The Atomic Mix," which is the album version, and "The Nuclear Mix," which is an extended version.

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