Iron Maiden is an English heavy metal band formed in Leyton, East London, in 1975 by bassist and primary songwriter Steve Harris. The band's discography has grown to 41 albums, including 17 studio albums, 13 live albums, four EPs, and seven compilations. They have also released 47 singles and 20 video albums. Two electronic games have been released with Iron Maiden soundtracks, and the band's music is featured in a number of other video games.

As pioneers of the new wave of British heavy metal movement, Iron Maiden achieved initial success during the early 1980s. After several line-up changes, the band went on to release a series of UK and US platinum and gold albums, including 1980's debut album, 1981's Killers, 1982's The Number of the Beast, 1983's Piece of Mind, 1984's Powerslave, 1985's live release Live After Death, 1986's Somewhere in Time, 1988's Seventh Son of a Seventh Son, 1990's No Prayer for the Dying, and 1992's Fear of the Dark. In 1982 the band released its album The Number of the Beast, the first with Bruce Dickinson, who replaced Paul Di'Anno as lead singer. This was a turning point in their career, helping establish Iron Maiden as one of the most important heavy metal artists in history. By 2010, more than 14 million copies of the album had been sold. The Number of the Beast is considered one of the best heavy metal albums of all time, and by December 2021 it had sold almost 20 million copies worldwide.