Chemistry (Girls Aloud album)

Chemistry is the third studio album by English-Irish girl group Girls Aloud. It was released in the United Kingdom on 5 December 2005 by Polydor Records. After the success of What Will the Neighbours Say?, the album was again entirely produced by Brian Higgins and his production team Xenomania. Chemistry is a loose concept album which details celebrity lifestyle and "what it's like to be a twentysomething girl in London." A number of the songs avert the verse-chorus form typical of pop music.

Chemistry received widespread acclaim from many contemporary music critics upon its release. Despite a relatively low chart position (peaking at 11, the lowest charting release by the group), the album yielded four top ten singles and was certified platinum in both the United Kingdom and Ireland, selling over 390,000 copies combined between the 2 countries. The album was followed by the Chemistry Tour, which had Girls Aloud performing in arenas for the first time.

For the album's 20th anniversary, it was reissued in September 2025 in three formats: a pink vinyl LP, a picture disc vinyl LP, and a three-CD deluxe edition, as well as a digital download and on streaming. The non-vinyl editions feature the original UK album along with remixes, alternative cuts, new alternative mixes, rarities, and two previously unreleased tracks: "Naked in the Shower" and "You Go Too Fast (Demo)".