The Forbidden Territory is a novel by British writer Dennis Wheatley, published by Hutchinson in 1933.

The Duke de Richleau receives a letter that is a code from his missing friend the young American Rex Van Ryn, who hunted for treasure lost during the Soviet takeover of Russia, but who is now in prison somewhere in that vast country.

The novel was bought for adaptation to film by Richard Wainwright for Alfred Hitchcock to direct.

The film was directed Phil Rosen and was released in 1934, distributed by Gaumont-British Picture Corporation.

Its main actors were Gregory Ratoff, Ronald Squire, and Binnie Barnes.