The Man Who Talked Too Much is a 1940 American drama film directed by Vincent Sherman and written by Walter DeLeon and Earl Baldwin. Starring George Brent, Virginia Bruce, Brenda Marshall, Richard Barthelmess, William Lundigan, George Tobias and John Litel, the film was released by Warner Bros. on July 16, 1940.

The Man Who Talked Too Much is the second of three films adapted from the 1929 play The Mouthpiece by Frank J. Collins, in which a former prosecutor, disillusioned by sending an innocent man to the electric chair, takes the saying "Better that a hundred guilty men go free than one innocent man suffer the death penalty" one step further by becoming a defense attorney for gangsters and adroitly tightrope walking legal ethics. Collins based his protagonist on Manhattan defense attorney William Joseph Fallon, dubbed "The Great Mouthpiece" in the New York press, who had a short but spectacularly successful career before succumbing to the effects of his own dissoluteness at the age of 41.