"Rehab" is a song recorded by Barbadian singer Rihanna for her third studio album, Good Girl Gone Bad (2007). Def Jam Recordings serviced the song to contemporary hit radio in the United States on October 6, 2008, as the eighth and final single from the album. It was released in the United Kingdom as a CD single on December 8, 2008. Development of "Rehab" began while Rihanna was accompanying Timbaland on Justin Timberlake's FutureSex/LoveShow tour in 2007. Timberlake wrote the song in collaboration with his producers, Hannon Lane and Timbaland, and provided additional vocals. "Rehab" is a mid-paced R&B song with an emotional, melancholy chorus; the lyrics are about the protagonist's painful memories of her former lover, who is portrayed metaphorically as a disease.

"Rehab" reached top-ten positions on the singles charts in Austria, Germany, the Netherlands and Norway. It reached number 16 on the UK Singles Chart and number 18 on the US Billboard magazine's Hot 100. It was certified double platinum by the Recording Industry Association of America (RIAA). Anthony Mandler directed the accompanying music video, which was shot in Vasquez Rocks Park, near Los Angeles. It won the Urban Music Award for Best Music Video. Rihanna performed "Rehab" on the Good Girl Gone Bad Tour (2007–09), and occasionally on the Last Girl on Earth (2010–11).

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