Knock Off is a 1998 action film directed by Tsui Hark and starring Jean-Claude Van Damme and Rob Schneider (in his first dramatic role). The film was released in the United States on September 4, 1998. The title is a double entendre, as the term colloquially refers to both counterfeit goods as well as targeted killing. The film is one of the last in the world to feature Kai Tak Airport still in use; the airport closed in 1998.

It was Hark's second and last American film; he returned to Hong Kong after Knock Off, feeling unsatisfied with his work in the United States. The film is also the second collaboration between Van Damme and writer Steven E. de Souza, the first film being Street Fighter, released in 1994.