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. Anna May Wong reprised her stage role from the New York production in the movie. The supporting cast features Lloyd Nolan and Anthony Quinn.

Robert Florey was a French-American director, screenwriter, film journalist and actor.