Cihangir Ghaffari (; born 9 September 1940), also credited as John Ghaffari or John Foster, is an Azerbaijani-born Iranian actor and film producer with an international career.
Originally from Baku, Ghaffari began his screen acting career in Imperial Iran in the 1960s. Beginning in the 1970s, he became a star of Turkish cinema. His popularity there led him to integrate the cast of international productions, such as Shaft vuelve a Harlem (1972) by Gordon Parks, ' (1973) by Jesús Franco, The Witches Mountain (1974) by Raúl Artigot, Dick Turpin (1974) by Fernando Merino, and Hundra (1983) by Matt Cimber.
He also served as a producer on titles such as Hundra (1983), Yellow Hair and the Fortress of Gold (1984) and La cruz de Iberia (1990). In 1975, he had a small appearance on the American television series Medical Center. In the early 1990s, Ghaffari retired from the film scene.