"Integral" is a 2007 single by British synthpop duo Pet Shop Boys, released in an electronic download-only format on 8 October. It was the only single released to promote the band's remix album Disco 4 in 2007. The track was originally released on the band's 2006 album Fundamental and many sources consider it to be the fourth single from that album.

The single was the first download-only single released by Pet Shop Boys and peaked at #197 on the UK Singles Chart. Online digital media delivery company 7digital has announced that of its top three singles of the year, Integral was number three.

The single criticises the Identity Cards Act 2006. A statement from the band cited the issue as the reason that Tennant ceased his well-publicized support of Tony Blair's Labour party. The lyrics are fully masked and converted to the homage to Yevgeny Zamyatin's legendary dystopian book We, in which the inhabitants of the future One State try to build The Integral, a glass spaceship, in order to solve the cosmic equation and resolve all the problems in their One State.

The artwork for this single is a QR code, which, when scanned, gives a link to the Pet Shop Boys' website.

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