Zorro's Fighting Legion is a 1939 Republic Pictures film serial consisting of twelve chapters starring Reed Hadley as Zorro and directed by William Witney and John English. The plot revolves around his alter-ego Don Diego's fight against the evil Don Del Oro.

A serial film, film serial, movie serial, or chapter play, is a motion picture form popular during the first half of the 20th century, consisting of a series of short subjects exhibited in consecutive order at one theater, generally advancing weekly, until the series is completed. Usually, each serial involves a single set of characters, protagonistic and antagonistic, involved in a single story, which has been edited into chapters after the fashion of serial fiction and the episodes cannot be shown out of order or as a single or a random collection of short subjects.