"Integral" is a song by English synth-pop duo Pet Shop Boys from their ninth studio album, Fundamental (2006). A remixed version of the song was released on 8 October 2007 as a download-only single to promote the duo's fourth remix album, Disco 4 (2007).^[2] The single peaked at number 197 on the UK Singles Chart.

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

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.^{[citation needed]} The lyrics are fully masked and converted to the homage to Yevgeny Zamyatin's dystopian novel We,^{[citation needed]} 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.

• Digital single^[3]

1. "Integral" (PSB Perfect Immaculate mix) – 7:16
2. "Integral" (Dave Spoon mix) – 7:10