Flash Gordon's Trip to Mars is a 1938 Universal Pictures 15–chapter science-fiction movie serial based on the syndicated newspaper comic strip Flash Gordon. It is the second of the three Flash Gordon serials made by Universal between 1936 and 1940. The main cast from the first serial reprise their roles: Buster Crabbe as Flash Gordon, Jean Rogers as Dale Arden, Frank Shannon as Dr. Alexis Zarkov, Charles B. Middleton as Ming the Merciless, and Richard Alexander as Prince Barin. Also in the principal cast are Beatrice Roberts as Queen Azura, Donald Kerr as Happy Hapgood, Montague Shaw as the Clay King, and Wheeler Oakman as Ming's chief henchman. The serial was followed by Flash Gordon Conquers the Universe (1940).

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.