What Men Know (German: Was wissen denn Männer) is a 1933 German drama film directed by Gerhard Lamprecht and starring Hans Brausewetter, Erwin Kalser and Toni van Eyck.

The film's sets were designed by the art director Werner Schlichting.

A young woman from the country has a relationship with a travelling salesman who then abandons her.

Leo Brecher attempted to release the film in the United States under the title Hertha's Awakening (Herthas Erwachen), but it was banned in New York.

This article related to a German film of the 1930s is a stub.