Stalag 17 is a 1953 American war film directed by Billy Wilder. It tells the story of a group of American airmen confined with 40,000 prisoners in a World War II German prisoner-of-war camp "somewhere on the Danube". Their compound holds 630 sergeants representing many different aircrew positions, but the film focuses on one particular barracks, where the men come to suspect that one of their number is an informant. The film was directed and produced by Billy Wilder, who with Edwin Blum adapted the screenplay from the Broadway play of the same name. The play was written by Donald Bevan and Edmund Trzcinski on the basis of their experiences as prisoners in Stalag 17B in Austria.