The Case of the Frightened Lady is a 1940 British, black-and-white, crime, drama, mystery thriller, directed by George King and starring Marius Goring as Lord Lebanon, Helen Haye as Lady Lebanon, Penelope Dudley Ward as Isla Crane, George Merritt as Detective Inspector Tanner, Ronald Shiner as Detective Sergeant Totty and Felix Aylmer as Dr Amersham. It was produced by Pennant Picture Productions and presented by British Lion Film Corporation. The film is based on the 1931 play by Edgar Wallace.

This production was the second time that Wallace’s play had been adapted for the cinema. The first production in 1932 was directed by T. Hayes Hunter and starred Emlyn Williams. The BBC also produced two television versions; the first in 1938 and the second in 1983 which starred Warren Clarke and Virginia McKenna.

In 2008, the film was released on DVD by Odeon Entertainment as part of their 'Best of British' collection. Prior to this release, the film had not been seen in public since its original release.