Dangerous to Know is a 1938 American crime film directed by Robert Florey and starring Anna May Wong, Akim Tamiroff and Gail Patrick.

The picture 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.

Stephen Recka, a gangster and former bootlegger, is now a powerful figure in city politics and business circles, with the mayor and local bank in his pocket.

Recka's birthday party is organized by his friend and hostess, Madame Lan Ying, with attendees who want a share in his city-wide power.

Margaret van Case, an impoverished member of the "town's first family" arrives and Recka charms her, making Lan Ying unhappy.

Lan Ying understands Recka's plans and that he intends to kill Phil, but his henchman is arrested before he can complete the hit.

Bosley Crowther of The New York Times called the film a "second-rate melodrama, hardly worthy of the talents of its generally capable cast.