"Q.I" (English: "IQ") is a 2005 song recorded by French singer-songwriter Mylène Farmer. It was the second single from her sixth studio album, Avant que l'ombre..., and was released on 4 July 2005. Like all other tracks from the album, the lyrics were written by Farmer and the music was composed by Laurent Boutonnat. The primary meaning of the song is the attraction to one's partner's intelligence, but the lyrics are ambiguous enough to allow a more sexual interpretation. The accompanying music video was filmed by Benoît Lestang in Budapest and starred Rafael Amargo and Farmer, performing soft erotic scenes in a bedroom; however, the video was not well received. Variously received by the media, the song became a top ten hit in France and Belgium (Wallonia).

Since the album release, many fans wanted "Q.I" released as a single, viewing it as a potential hit. The song was played for the first time on NRJ on 13 May in a short version, without the musical bridge and the second chorus. The first remix was produced by Chris Cox to win over the general public and premiered on NRJ on 15 June. It was heavily played on radios and was followed by two longer remixes by Cox, who also remixed "Désenchantée" on the 2003 album RemixeS, then "Peut-être toi", intended for the dance floors. Two other remixes were produced and broadcast: a techno remix with a slow rhythm, the 'CQFD R.club' by Syd, who had already remixed "Libertine" and "Fuck Them All" in 2003 and 2005 respectively, and an electronic and slow remix, the 'rodin's extended club mix', by the Liquid Twins, who also took part in a remix of "L'amour n'est rien...". The single was eventually released in three formats — CD single, CD maxi, 7" maxi — on 4 June, two months after its first broadcast on radio. There was a printing error on the maxi vinyl: part of the remixes was engraved on both sides with other songs unrelated to Farmer.

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