Without Warning may refer to:

• Without Warning!, a 1952 film noir
• Without Warning (1980 film), a film starring Jack Palance
• Without Warning (1994 film), a made-for-television science fiction film
• Without Warning (1999 film), a made-for-television film starring Arkie Whiteley
• Best of the Best 4: Without Warning, a 1998 direct-to-video martial arts film
• Without Warning (TV series), a 2006 Singaporean program broadcast by MediaCorp Channel 8
• Without Warning: The James Brady Story, a 1991 made-for-television film written by Robert Bolt
• Diagnosis Murder: Without Warning, a made-for-television film based on the TV series Diagnosis: Murder

Without Warning! is a black-and-white 1952 film noir directed by Arnold Laven. The film is shot in a semidocumentary-style with police procedural voice-over narration in parts. Without Warning! was released commercially for the first time on DVD in 2005. Previously, the film was considered lost and unavailable for viewings.

Das Geheimnis der fliegenden Teufel (auch unter dem Titel Alien Shock im Videoverleih bekannt), ist ein Science-Fiction-/Horrorfilm u. a. mit Martin Landau und David Caruso.