"Number 1" is an electronic–dance song performed by British group Goldfrapp. The song was written and produced by Alison Goldfrapp and Will Gregory for the duo's third album Supernature (2005). The song features a synthesizer and bass arrangement and was written about the importance and meaningfulness that somebody shares with another, despite that it might not necessarily last.

The song was released as the album's second single in October 2005 to positive reviews from music critics. It was a commercial success, reaching the top forty on the majority of the charts it entered, and topped the US dance chart. The song has been remixed a number of times and was featured in advertising campaigns for the US retail company Target.

"Number 1" is a mid-tempo electronic love song about the importance and meaningfulness that somebody shares with another, despite that it might not necessarily last. The song was composed as a collaborative effort between Alison Goldfrapp and Will Gregory in late 2004 in the countryside of Bath, England. The song was written and recorded while Goldfrapp and Gregory were jamming in the recording studio, bouncing song ideas off each other. According to Goldfrapp, the song's lyrics are "a little bit more reflective and sensual" than those she had composed on Felt Mountain (2000) and Black Cherry (2003).

"Number 1" is written in the common verse-chorus form and features instrumentation from synthesizers and a bass guitar. It contains a synth and bass arrangement that the duo would use frequently on the rest of Supernature. Most of the song was composed on an old Roland String synth keyboard because Goldfrapp enjoyed the sounds that it exudes.

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