"Rehab" is a song by Amy Winehouse from her second studio album, Back to Black. Written by Winehouse, it was released as the album's lead single in the United Kingdom on 23 October 2006. The lyrics are autobiographical, describing the protagonist's drinking habits and refusal to enter rehabilitation clinics. It is generally considered as Winehouse's signature song.
Winehouse's subsequent public battle with substance abuse and the song's popularity contributed to its numerous appearances in the mainstream media. Several artists have covered the song, both in official releases and live. There are two official remixes; the first features rapper Jay-Z and the second features rapper Pharoahe Monch. In the UK, a further remix by electronic band Hot Chip was also released.