I Was a Communist for the FBI is a 1951 American film noir crime film directed by Gordon Douglas and starring Frank Lovejoy. The film was produced by Bryan Foy who was head of Warners B picture unit until 1942.

The film was based on a series of stories written by Matt Cvetic that appeared in The Saturday Evening Post. The stories were later turned into a best-selling book, and a radio show starring Dana Andrews that ran for 78 episodes from April 23, 1952, until October 14, 1953.The story follows Cvetic, who infiltrated a local Communist Party cell for nine years and reported back to the Federal Bureau of Investigation (FBI) on their activities.