Undercover, also known as Undercover: How to Operate Behind Enemy Lines and How to Operate Behind Enemy Lines, is a 1943 Office of Strategic Services training film, directed by and featuring John Ford. It was edited by Ford's longtime collaborator Robert Parrish.

Victor Varconi was a Hungarian actor who initially found success in his native country, as well as in Germany and Austria, in silent films, before relocating to the United States, where he continued to appear in films throughout the sound era. He also appeared in British and Italian films.