The Man Who Knew Too Much is a 1956 American mystery thriller film directed and produced by Alfred Hitchcock, starring James Stewart and Doris Day. It is Hitchcock's second film using this title, following his own 1934 film of the same name but featuring a significantly altered plot and script.

James Maitland Stewart was an American actor. Known for his distinctive drawl and everyman screen persona, Stewart's film career spanned 80 films from 1935 to 1991. With the strong morality, which he portrayed both on and off the screen, he epitomized the "American ideal" in the mid-twentieth century. In 1999, the American Film Institute (AFI) ranked him third on its list of the greatest American male actors. He received numerous honors including the AFI Life Achievement Award in 1980, the Kennedy Center Honor in 1983, as well as the Academy Honorary Award and Presidential Medal of Freedom, both in 1985.