An underground film is a film that is out of the mainstream either in its style, genre, or financing.
The first printed use of the term "underground film" occurs in a 1957 essay by American film critic Manny Farber, "Underground Films." Farber uses it to refer to the work of directors who "played an anti-art role in Hollywood." He contrasts "such soldier-cowboy-gangster directors as Raoul Walsh, Howard Hawks, William Wellman," and others with the "less talented De Sicas and Zinnemanns [who] continue to fascinate the critics." However, as in "Underground Press", the term developed as a metaphorical reference to a clandestine and subversive culture beneath the legitimate and official media.
In the late 1950s, "underground film" began to be used to describe early independent film makers operating first in San Francisco, California and New York City, New York, and soon in other cities around the world as well, including the London Film-Makers' Co-op in Britain and Ubu Films in Sydney, Australia. The movement was typified by more experimental filmmakers working at the time like Stan Brakhage, Harry Everett Smith, Maya Deren, Andy Warhol, Kenneth Anger, Jonas Mekas, Ken Jacobs, Ron Rice, Jack Smith, George Kuchar, Mike Kuchar, and Bruce Conner.