Wavelength is a 1967 independently-made experimental film by Canadian artist Michael Snow. Shot from a fixed camera angle, it depicts a loft space with an extended zoom over the duration of the film. Considered a landmark of avant-garde cinema, it was filmed over one week in December 1966 and edited in 1967, and is an example of what film theorist P. Adams Sitney describes as "structural film", calling Snow "the dean of structural filmmakers."

Wavelength is often listed as one of the greatest underground, art house and Canadian films ever made. The film has been designated and preserved as a masterwork by the Audio-Visual Preservation Trust of Canada. In a 1969 review of the film published in Artforum, Manny Farber describes Wavelength as "a singularly unpadded, uncomplicated, deadly realistic way to film three walls, a ceiling and a floor... it is probably the most rigorously composed movie in existence."