The 10th Victim (Italian: La decima vittima) is a 1965 science fiction film directed and co-written by Elio Petri, starring Marcello Mastroianni, Ursula Andress, Elsa Martinelli, and Salvo Randone. An international co-production between Italy and France, it is based on Robert Sheckley's 1953 short story "Seventh Victim".

Taking place in the year 2079 in the aftermath of World War III, the film's focus is on a government-endorsed program known as "The Big Hunt", whereby contestants from around the world act as "hunters" and "victims" in two-person battles to the death as a means of avoiding mass warfare. The plot follows veteran Big Hunt contestants Caroline Meredith (Andress) and Marcello Poletti (Mastroianni), who are respectively assigned the roles of hunter and victim for one such confrontation, which is complicated by their budding romance. Like Petri's other films, The 10th Victim is a work of socio-political satire, while also combining science fiction themes with conventions of the commedia all'italiana genre.An avid reader of science fiction, Petri began work on an adaptation of Sheckley's story in 1961; producer Carlo Ponti came onboard the project due to the involvement of Mastroianni. A variety of screenwriters worked on the script to varying degrees without receiving an onscreen credit, including Suso Cecchi D'Amico, Nate Monaster and Ernesto Gastaldi. Ponti's lack of interest in the science fiction genre led to his mandating of more comedic elements in the story against Petri's wishes, including altering its original, pessimistic ending. Backed by financial support from Joseph E. Levine's Embassy Pictures, filming took place primarily on location in Rome and New York City from June to September 1964; produced at the height of the pop art movement in Italy, Petri sought to create a vision of the future that juxtaposes that style's imagery with Rome's ancient and modern architectural structures, such as the Colosseum and the EUR district.Upon release, The 10th Victim performed below Ponti's expectations in Italy and received mixed reviews from critics. In the decades since its initial release, the film has garnered a cult following, and its imagery has been referenced or parodied in other films, notably the Austin Powers franchise; it is also considered to be a forerunner to works depicting televised fights to the death, such as The Hunger Games. A novelization of the film, written by Sheckley, was published in 1966, this was followed by two sequels, Victim Prime and Hunter/Victim in 1987 and 1988, respectively. Although several attempts to produce a remake of The 10th Victim have been announced, none have entered production.