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.
Sections of the film have been released on home video as the 30 minute Whatever Happened to Vileness Fats? featurette in 1984, and on the Icky Flix DVD in 2001 as a remastered 17 minute "concentrate", excising numerous plot points. Additional clips and outtakes from the production were seen in the 2015 documentary, Theory of Obscurity: A Film About The Residents.