Der Frosch mit der Maske

Der Frosch mit der Maske Frøn med masken
German Filmprogrammheft () for the film
Directed by	Harald Reinl
Produced by	Preben Philipsen
Written by	Egon Eis Jochen Joachim Bartsch ()
Based on	The Fellowship of the Frog by Edgar Wallace
Starring	Siegfried Lowitz Joachim Fuchsberger
Music by	Willy Mattes () Karl Bette () (songs)
Cinematography	Ernst W. Kalinke ()
Edited by	Margot Jahn
Production company	Rialto Film
Distributed by	Constantin Film
Release date	1959 (1959)
Running time	90 minutes
Country	Germany Denmark
Language	German Danish
Budget	under 600,000 Deutsche Mark

Der Frosch mit der Maske (Face of the Frog) is a 1959 West German-Danish black-and-white crime film directed by Harald Reinl and starring Siegfried Lowitz and Joachim Fuchsberger. It was the first of the very successful series of films based on works by Edgar Wallace produced by Rialto Film. This film was adapted from the 1925 novel The Fellowship of the Frog.

The film is adapted from Edgar Wallace's novel The Fellowship of the Frog (1925). Previous versions were made in 1928 in the US (as a serial) and in 1937 in the UK, both titled The Mark of the Frog.

The project was deemed risky, as so far no German crime film had really succeeded at the box office after World War II. The initiative to try came from Waldfried Barthel (), head of Constantin Film who approached his friend Preben Philipsen with the idea. Philipsen acquired the rights for the movie adaption of The Fellowship of the Frog and The Crimson Circle from Penelope Wallace, with an option on other novels by her father should the films be successful. Barthel decided on Reinl as director and fixed production cost at a maximum of 600,000 Deutsche Mark. As scriptwriter the producer hired Egon Eis who had worked on the 1931 adaption of The Squeaker. Eis' script for the Frog, delivered in January 1959 under the nom de plume "Trygve Larsen", stuck closely to the novel. Jochen Joachim Bartsch, a friend of Reinl, also worked on the script. The "comic relief" character, played by Arent, was added by the script writers, he does not exist in the novel. Some characters were much reduced in significance (Broad and Maitland), some were dropped altogether (Maitland's sister). Another change was making Fuchsberger's character the nephew of Sir Archibald, the head of Scotland Yard. In addition, the name for Brockmann's character was changed: in Wallace's novel he was called "Harry Lime" (or Lyme). Since this had been the name of Orson Welles' character in Carol Reed's The Third Man (1949), the producers decided to change it.