O.S.S. is a 1946 American war film starring Alan Ladd and Geraldine Fitzgerald about the Office of Strategic Services. It was directed by Irving Pichel, who would later be blacklisted by the House Un-American Activities Committee, and written by Richard Maibaum, a World War II veteran who would later write twelve of the first 15 James Bond films. Maibaum, a former Broadway actor, also narrates the film.