Sidney Lumet (pronounced , loo-MET; born June 25, 1924) is an Academy Award winning American film director, with over 50 films to his name, including the critically acclaimed 12 Angry Men (1957), Serpico (1973), Dog Day Afternoon (1975), Network (1976) and The Verdict (1982), all of which, except for Serpico (1973), earned him Academy Award nominations for Best Director.

According to The Encyclopedia of Hollywood, Lumet is one of the most prolific directors of the modern era making more than one movie per year on average since his directorial debut in 1957. He is especially noted for his ability to draw major actors to his projects. "Because of his visual economy, strong direction of actors, vigorous storytelling and use of the camera to accent themes," writes TCM, "Lumet produced a body of work that could only be defined as extraordinary."

One of his steady themes during his career has been the "fragility of justice and the police and their corruption," according to Thomson’s Biographical Dictionary of Film. He can deliver "powerhouse performances from lead actors," and fine work from character actors and is today one of the foremost figures of New York moviemaking. His sensitivity to actors and to the rhythms of the city have made him "America’s longest-lived descendant of the 1950s Neorealist tradition and its urgent commitment to ethical responsibility."