Dangerous to Know is a 1938 American crime film and starring Anna May Wong, Akim Tamiroff and Gail Patrick. The movie was directed by Robert Florey. Bosley Crowther of The New York Times called the film a "second-rate melodrama, hardly worthy of the talents of its generally capable cast." It is based on British crime writer Edgar Wallace's hit 1930 play On the Spot which had been inspired by the career of Al Capone.