"Rehab" is a song written and recorded by English singer-songwriter Amy Winehouse, from her second and final studio album Back to Black (2006).

Produced by Mark Ronson, the lyrics are autobiographical and address Winehouse's refusal to enter a rehabilitation clinic for alcohol.

[6] Winehouse's public battle with drug and alcohol addiction, and subsequent death, have contributed to the song's continuing popularity and appearance in the media.

The song has been covered by a number of artists, including Taking Back Sunday, Justin Timberlake, Fergie, and Kanye West.

[7] In the film Amy, director Asif Kapadia showed an interview with Mitch in which he explained that "he didn't believe [Winehouse] needed treatment [for her drug and alcohol addiction]".

In an appearance on the British talk show Loose Women, Mitch clarified the comments he made in the film, saying that Kapadia misinterpreted what he actually said to Winehouse: "[...] I say that Amy didn't need to go to rehab, right?

Rolling Stone characterised it as a "Motown-style winner with a banging beat and a lovesick bad girl testifying like Etta James.

"[12] Billboard remarked that Winehouse's vocals on the song were "Shirley Bassey-meets-Ella Fitzgerald" and called the track "a better buzz than a double-gin martini.

"[9] British trade paper Music Week called the song a "classy treat", praising Ronson's production and noting that the track's "overall effect is one of adroit skill with great hooks".

Writer Josh Tyrangiel praised Winehouse for her confidence, opining, "What she is is mouthy, funny, sultry, and quite possibly crazy" and, "It's impossible not to be seduced by her originality.

[25] After lingering in the bottom portions of the Hot 100 for several months, the song suddenly jumped 38 spots to number ten on the 23 June chart,[26] due to digital sales following Winehouse's live performance of the song on the MTV Movie Awards on 3 June 2007; sales of the official remix featuring rapper Jay-Z also had a small effect, helping it to peak in the 70s on the iTunes Top 100 in the US.

It reached the top 20 in France, the Netherlands, Austria, Switzerland and Finland, attaining a peak position of number 23 on the European Hot 100 Singles.

In contrast to the lyrics, the video ends with Winehouse in rehab, sitting on a bed in a white-tiled clinical ward room with her band around her.