Madonna: Truth or Dare (also known as In Bed with Madonna internationally) is a 1991 American documentary film by director Alek Keshishian chronicling the life of entertainer Madonna during her 1990 Blond Ambition World Tour. Madonna approached Keshishian to do an HBO special on the tour after watching his Harvard senior project. Initially planned to be a traditional concert film, Keshishian was so impressed with the backstage life that he persuaded Madonna to make it the focus of the film. Madonna funded the project and served as executive producer. The film was edited to be in black-and-white, in order to emulate cinéma vérité, while the performance scenes are in color.

Madonna: Truth or Dare was screened out of competition at the 1991 Cannes Film Festival and was given a limited release on May 10, 1991; two weeks later, it had its worldwide release. It opened to positive reviews although certain scenes, such as one where Madonna visits her mother's grave, were criticized. Madonna was nominated for a Razzie Award for Worst Actress. With a worldwide gross of $29 million, it was the highest-grossing documentary of all time, until Bowling for Columbine surpassed it in 2002. Truth or Dare has been noted as a groundbreaking film for its casual portrayal of homosexuality, and was compared to Paris Is Burning (1990). It has also had an impact on reality television and celebrity culture, inspiring parodies and other music-related documentaries.