Phase IV is a 1974 American science fiction film. It is the only feature-length film directed by the noted title sequence designer Saul Bass. It starred Michael MurphyNigel Davenport and Lynne Frederick.

The interiors of the film were shot at Pinewood Studios in England and the exterior locations were shot in Kenya, Africa even though the film is set in the Arizona desert of the United States. It was produced by Alced Productions and Paramount Pictures.

The film was a box office flop and as a result this was the only feature film directed by Bass. It has since gained a cult following due to TV airings beginning in 1975 and also being shown on Mystery Science Theater 3000 during the KTMA era.

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