Lancer Spy is a 1937 American thriller film directed by Gregory Ratoff and starring Dolores Del Rio and George Sanders.

She had previously written the 1932 memoir I Was a Spy, the basis of a 1933 film of the same title.

[1] Gregory Ratoff signed a contract with 20th Century Fox to write, produce and direct.

The film was originally to star Michael Whalen[2] in the part that was eventually played by George Sanders.

[3][4][5] Peter Lorre was cast after his success in Think Fast, Mr Moto.