An Inconvenient Truth is a 2006 American documentary film directed by Davis Guggenheim about former vice president of the United States Al Gore's campaign to educate people about global warming. The film features a slide show that, by Gore's own estimate, he has presented over 1,000 times to audiences worldwide.

The idea to document Gore's efforts came from producer Laurie David, who saw his presentation at a town hall meeting on global warming, which coincided with the opening of The Day After Tomorrow. Laurie David was so inspired by his slide show that she, with producer Lawrence Bender, met with Guggenheim to adapt the presentation into a film. Premiering at the 2006 Sundance Film Festival and opening in New York City and Los Angeles on May 24, 2006, the film was a critical and commercial success, winning two Academy Awards for Best Documentary Feature and Best Original Song. The film grossed $24 million in the US and $26 million in other countries' box offices, becoming the eleventh highest grossing documentary film to date in the United States.

Since the film's release, An Inconvenient Truth has been credited for raising international public awareness of global warming and reenergizing the environmental movement. The documentary has also been included in science curricula in schools around the world, which has spurred some controversy. A sequel to the film, titled An Inconvenient Sequel: Truth to Power, was released on July 28, 2017.