The Blue Fox is a 1921 American silent adventure film serial directed by Duke Worne. An incomplete print of the film exists at the UCLA Film and Television Archive.
American sailor Captain Crooks (Baker) falls in love with Ynez Montego (Revier), daughter of Don Guzman de Ruis y Montejo (Lederer), who wants Ynez to marry the wealthy Eurasian, Ismid Matrouli (Cecil).
Captain William Ballard of the Territorials is sent to make a treaty with the natives. He meets resistance from the Boers, still unreconciled to British rule. He falls in love with Katryn van der Poel. He succeeds in rescuing a lost party and recovering important military dispatches.