Koyaanisqatsi is a 1982 American non-narrative documentary film directed and produced by Godfrey Reggio, featuring music by Philip Glass and cinematography by Ron Fricke. Described as an "essay in images and sound on the state of American civilization", the film comprises a montage of stock footage, slow motion, and time-lapse visuals of natural and urban environments across the United States. Following its premieres at the Telluride and New York Film Festivals in 1982, and it began a limited theatrical release the following year. Produced on a budget of $2.5 million, the film grossed $3.2 million at the box office, and was one of the highest-grossing documentaries of the 1980s.

The title comes from the Hopi word koyaanisqatsi, meaning "life out of balance". It is the first film in the Qatsi trilogy, which was followed by Powaqqatsi (1988) and Naqoyqatsi (2002). The trilogy depicts different aspects of the relationship between humans, nature and technology. Koyaanisqatsi is the best known of the trilogy and is considered a cult film.