Quiz

Contrary to popular belief, Fritz Lang did not change the title from "The Murderers are Among Us" to "M" due to fear of persecution by the Nazis. He changed the title during filming, influenced by the scene where one of the criminals writes the letter on his hand. Lang thought "M" was a more interesting title.

The organization of beggars mentioned in the film actually did exist in Berlin at the time.

Before making this, Peter Lorre had mainly been a comedic actor.

MGM studio executive Irving Thalberg assembled his writers and directors for a private screening of this film, telling them that they needed to be making films of this power and caliber. He also admitted that if anyone had brought a story of a child killer to him, he would have rejected it.

Fritz Lang's first sound film.