Structural film was an avant-garde experimental film movement prominent in the United States in the 1960s and which developed into the Structural/materialist films in the United Kingdom in the 1970s. 
The term was coined by P. Adams Sitney who noted that film artists had moved away from the complex and condensed forms of cinema practiced by such artists as Sidney Peterson and Stan Brakhage. "Structural film" artists pursued instead a more simplified, sometimes even predetermined art. The shape of the film was crucial, the content peripheral. This term should not be confused with the literary and philosophical term structuralism.
Sitney identified four formal characteristics common in Structural films, but all four characteristics are not usually present in any single film:
It has been noted by George Maciunas that these characteristics are also present in Fluxus films.