Without Warning, also known as It Came Without Warning, is a 1980 American science fiction horror 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.

The film is credited with being an inspiration for the 1987 film Predator, both of which star Kevin Peter Hall as a costumed alien hunter.