Ballistic: Ecks vs. Sever is a 2002 science fiction action thriller film directed and produced by Thai filmmaker Wych Kaosayananda (under the pseudonym of 'Kaos'), from a screenplay by Alan B. McElroy. The film stars Antonio Banderas and Lucy Liu as opposing secret agents who team up to fight a common enemy. It is an international co-production among the United States, Canada, and Germany.

Ballistic: Ecks vs. Sever was universally panned by critics and has been frequently described as one of the worst films ever made. Additionally, the film was also a box-office bomb, grossing $20.2 million on a production budget of $70 million, losing the studio an estimated $70.1 million. With a total of 119 reviews, by far the most for a film with a 0% approval rating, Ballistic: Ecks vs. Sever is the worst-reviewed film in the history of Rotten Tomatoes.