Ivan John Clark (born 1 November 1932) is an English actor, director, producer and writer. Clark is probably best known for his role as Just William in theatre and radio in the late 1940s and as the former husband of actress Lynn Redgrave, to whom he was married for 33 years. However, he established himself as a stage actor and director after moving to the United States in 1960, and became noted for directing plays featuring his wife in the 1970s beginning with A Better Place at Dublin's Gate Theatre (1973), then in America The Two of Us (1975), Saint Joan (1977–78), and a tour of California Suite (1976). In 1981, he co-directed the CBS television series House Calls, in which Redgrave starred.