A fan film is a film or video inspired by a film, television program, comic book or a similar source, created by fans rather than by the source's copyright holders or creators. Fan filmmakers have traditionally been amateurs, but some of the more notable films have actually been produced by professional filmmakers as film school class projects or as demonstration reels. Fan films vary tremendously in quality, as well as in length, from short faux-teaser trailers for non-existent motion pictures to full-length motion pictures.

According to media scholar, Henry Jenkins, fan films discussed represent a potentially important third space between the two. Shaped by the intersection between contemporary trends toward media convergence and participatory culture, these fan films are hybrid by nature—neither fully commercial nor fully alternative.

The earliest known fan film is Anderson 'Our Gang.' which was produced in 1926 by a pair of itinerant filmmakers. Shot in Anderson, South Carolina, the short is based on the Our Gang film series; the only known copy resides in the University of South Carolina's Newsfilm Library. Various amateur filmmakers created their own fan films throughout the ensuing decades, including a teenaged Hugh Hefner, but the technology required to make fan films was a limiting factor until relatively recently. In the 1960s UCLA film student Don Glut filmed a series of short black and white "underground films", based on adventure and comic book characters from 1940s and 1950s motion picture serials. Around the same time, artist Andy Warhol produced a film called Batman Dracula which could be described as a fan film. But it wasn't until the 1970s that the popularization of science fiction conventions allowed fans to show their films to the wider fan community.

Fan or FAN may refer to:

One of several types of fan-shaped deposits of sediment caused by the flow of streams or glacial melt:

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A film, also called a movie or motion picture, is a series of still or moving images. It is produced by recording photographic images with cameras, or by creating images using animation techniques or visual effects. The process of filmmaking has developed into an art form and industry.

Films are cultural artifacts created by specific cultures, which reflect those cultures, and, in turn, affect them. Film is considered to be an important art form, a source of popular entertainment and a powerful method for educating – or indoctrinating – citizens. The visual elements of cinema give motion pictures a universal power of communication. Some films have become popular worldwide attractions by using dubbing or subtitles that translate the dialogue into the language of the viewer.

Films are made up of a series of individual images called frames. When these images are shown rapidly in succession, a viewer has the illusion that motion is occurring. The viewer cannot see the flickering between frames due to an effect known as persistence of vision, whereby the eye retains a visual image for a fraction of a second after the source has been removed. Viewers perceive motion due to a psychological effect called beta movement.