Inspector Harold Francis Callahan, nicknamed Dirty Harry, is a fictional character and protagonist of the Dirty Harry film series, which consists of Dirty Harry (1971), Magnum Force (1973), The Enforcer (1976), Sudden Impact (1983), and The Dead Pool (1988). Callahan is portrayed by Clint Eastwood in each film.

Dirty Harry is a 1971 American neo-noir action thriller film produced and directed by Don Siegel, the first in the Dirty Harry series. Clint Eastwood plays the title role, in his first appearance as San Francisco Police Department (SFPD) Inspector "Dirty" Harry Callahan. The film drew upon the real-life case of the Zodiac Killer as the Callahan character seeks out a similar vicious psychopath.