Gun Jack is a character in the Tekken fighting game series. Gun Jack appears in Tekken 3 as well as the spin-offs Tekken Tag Tournamentand Tekken Advance. The last two games are non-canonical to the main storyline. During Ganryu's absence in Tekken 3, Gun Jack took some of his unique moves (such as Sumo Stomp). Gun Jack's successor, Jack-5, does not have the unique Ganryu moves that Gun Jack had. Doctor Abel also tried to destroy this Jack robot, using the same method he used to destroy Jack-2, but he failed because Gun Jack generated a force field that protected himself and his creator Jane. Gun Jack also protected Jane when the Tekken Force attacked her inside Mishima Zaibasu Heavy Industries.

His title in the original trilogy is Disordered Killing Monster.

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