"Work It Out" is the first single by American R&B singer Beyoncé Knowles. It was released on June 11, 2002, by Columbia Records as the lead single from the soundtrack album of the film Austin Powers in Goldmember, in which Knowles stars as Foxxy Cleopatra. It was later included on the international editions of Knowles' debut album, Dangerously in Love (2003). Knowles co-wrote the song with its producers, Pharrell Williams and Chad Hugo. "Work It Out" is an R&B song which incorporates elements of 1960s and 1970s funk and post-disco.

The song was generally well received by music critics, many of whom complimented its retro style and various influences. It has been credited as the beginning of Knowles' career as a successful solo artist, after finding success as the lead singer of Destiny's Child. "Work It Out" was nominated in the category of Best Original or Adapted Song at the 2003 Black Reel Awards. Commercially, the song failed to make an impact on the US Billboard Hot 100 but managed to find success on a few Billboard component charts, topping the Billboard's Hot Dance Club Play chart. "Work It Out" also reached the top ten in Norway and the UK.

The song's accompanying music video was shot and directed by Matthew Rolston. The video features Knowles playing Foxxy Cleopatra, and draws inspiration from several 1960's and 1970s motifs. The video was nominated at the MTV Video Music Awards Japan in the category Best Video from a Film. "Work It Out" has been parodied and covered on several live television programs, including American Idol and America's Best Dance Crew. Since its release, the song has been regularly included on several of Knowles' tours and concerts.

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