Saturday Night Fever is a 1977 American dance drama film directed by John Badham and produced by Robert Stigwood. It stars John Travolta as Tony Manero, a young Italian-American man from Brooklyn who spends his weekends dancing and drinking at a local discothèque while dealing with social tensions and general restlessness and disillusionment with his life, and feeling directionless and trapped in his working-class neighborhood. The story is based upon "Tribal Rites of the New Saturday Night", an article by music writer Nik Cohn, first published in a June 1976 issue of New York magazine. The film features music by Bee Gees and many other prominent artists of the disco era.

Saturday Night Fever was a huge commercial success and had a tremendous effect on popular culture of the late 1970s. The film helped significantly to popularize disco music around the world and made Travolta, who was already well known from his role on TV's Welcome Back, Kotter, a household name. He was nominated for the Academy Award for Best Actor for his performance, becoming the fifth-youngest nominee in the category. The film showcased aspects of the music, the dancing, and the subculture surrounding the disco era: symphony-orchestrated melodies; haute couture styles of clothing; pre-AIDS sexual promiscuity; and graceful choreography. The Saturday Night Fever soundtrack, featuring disco songs by the Bee Gees, is one of the best-selling soundtracks of all time. John Travolta reprised his role of Tony Manero in Staying Alive in 1983, which was panned by critics despite being successful at the box office.

In 2010, Saturday Night Fever was deemed "culturally, historically, or aesthetically significant" by the Library of Congress and selected for preservation in the National Film Registry.