Without Warning is a 1980 American horror science fiction film directed by Greydon Clark and starring Jack Palance, Martin Landau, Tarah Nutter, and Kevin Peter Hall. Special effects designer Greg Cannom created the aliens for the low-budget film. The film released on September 26, 1980 and was released on home video for the first time on August 5, 2014 through Shout! Factory's Scream Factory label in a Blu-ray/DVD combo pack.

Walter Jack Palance was an American screen and stage actor, known to film audiences for playing tough guys and villains. He was nominated for three Academy Awards, all for Best Actor in a Supporting Role, for his roles in Sudden Fear (1952) and Shane (1953), and winning almost 40 years later for City Slickers (1991).