"Plus grandir" (English: "Keep Growing") is a 1985 song recorded by French singer-songwriter Mylène Farmer and is the first song written by the singer. It was released twice: first, on 25 September 1985 in a studio version as second single from Farmer's debut album Cendres de Lune, then on 12 May 1990 in a live mix version as second single from the live album En Concert. In spite of positive critics and a music video produced as a short film in cinemascope, the song achieved moderate success in France in terms of sales and chart performances.

After the relative failure of the "On est tous des imbéciles", Farmer separated from the songwriter Jerome Dahan and her contract with the record company RCA ended. She then signed with Polydor for two albums and, for the first time, she wrote the lyrics of her next single, "Plus grandir", which was released in September 1985 (it was also released in Canada, but without cover, and at the same time that "We'll Never Die", only released in this country), with "Chloé" as B-side. Despite sales fairly low, Polydor allowed the duo Mylène Farmer / Laurent Boutonnat to create the album Cendres de Lune, in March 1986.

About five years after the single's release, Farmer did not yet expect the relative success of this song, which was her first composition. She then decided to release this song for the second time, but in live version, after the success of the live album En Concert in 1990. The song's success was relative, except in nightclubs. Eventually, the song was the last collaboration at level of editing and management between Farmer and Bertrand Le Page because of artistic differences in late 1989.

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