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Jack is a common terran name. Jack may refer to:
- Jack, former second in command of the Screaming Skulls
- Jack, a marine in StarCraft: Ghost
- Jack Frost, a firebat officer in StarCraft: Insurrection
- Sherman Jack, xeno-imaging specialist
- Jack Larimer, captain of a Confederate Tactical Response Squad in the Guild Wars
- Luke Mancini, aka "Mr--Jack"
- Jack Pembleton, a detective in the Tarsonis Police Force
- Jack Ritschel, the voice actor for Edmund Duke and Zeratul in StarCraft and Brood War, but not StarCraft II.