Vileness Fats is an unfinished musical film project by avant-garde art collective The Residents, filmed primarily between 1972 and 1976. The Residents shot over fourteen hours of film and videotape for the project, but were not even two-thirds of the way through their incomplete script before they cancelled the production.

The Residents are an American art collective and art rock band best known for their avant-garde music and multimedia works. Since their first official release, Meet the Residents (1974), they have released over 60 albums, numerous music videos and short films, three CD-ROM projects, and ten DVDs over the course of over half a century. They have undertaken seven major world tours and scored multiple films. Pioneers in exploring the potential of CD-ROM and similar technologies, the Residents have won several awards for their multimedia projects. They founded Ralph Records, a record label focusing on avant-garde music, in 1972.