Hammerhead is a 1968 British Eurospy thriller film directed by David Miller and starring Vince Edwards, Judy Geeson, and Diana Dors. Its plot concerns a criminal mastermind who attempts to steal NATO secrets, with an American agent hot on his trail. It is based on the 1964 novel of the same title by English novelist James Mayo, and produced by Irving Allen and written by Herbert Baker, who made the Matt Helm films for Columbia Pictures. It was filmed in London and Portugal.