Sylvia of the Secret Service is a 1917 American silent thriller film directed by George Fitzmaurice and starring Irene Castle, J.H.

[1] Erich von Stroheim worked as assistant director and technical advisor as well as playing the role of the villain.

The film's sets were designed by the art director Anton Grot.

[2] During World War I, an American secret agent attempt to prevent a German sabotage ring from blowing up ammunition dumps in New York.

This article about a silent thriller film is a stub.