John Steiner (born 7 January 1941 in Chester) is an English actor. Tall, thin and gaunt, Steiner attended the Royal Academy of Dramatic Arts and worked for a few years at the BBC. Steiner featured in a lead role in a television production of Design for Living by Noel Coward. Later he found further work primarily in films. In the late 1960s, Steiner was hired to play a part in the spaghetti western Tepepa. He found himself in demand in Italy and relocated there, specializing in playing villains in a great number of Italian B-movies and exploitation films. John Steiner has appeared in various genres of movies, including horror films and police actioners. He also became a favorite of famed Italian filmmaker Tinto Brass featuring in Salon Kitty alongside Ingrid Thulin and Helmut Berger.

Steiner was in very steady demand until the late 1980s. As the Italian film industry dwindled, Steiner retired from acting in 1991 and relocated to California, where he became a real estate agent.