The Argyle Secrets is a 1948 American film noir mystery thriller written and directed by Cy Endfield and starring William Gargan and Marjorie Lord.

[5] Engfield admirer Jonathan Rosenbaum called it the first Endfield film "that he would later recall with any pride or affection... a surprisingly beautiful Z-budget thriller hastily adapted from his first radio script and shot in six days.

"[6] Reporter Harry Mitchell tracks down incriminating papers showing that some leading Americans collaborated with the Nazis during the war.

[10] Rosenbaum wrote, "There are so many interlocking and often paranoid intrigues crammed into one twenty-four-hour story line that even after three viewings I'd defy anyone to come up with a complete synopsis.

"[7] Variety called the film "a particularly interesting B movie in its suggestion that the U.S. government secretly brought Nazis into the country to work for the military.