Jack may refer to:
- Jack Marley - An elderly ex-worker at the Springfield Nuclear Power Plant.
- Jack Bauer - An American federal agent.
- Jack Larson - A slick spokesman and president for Laramie Cigarettes.
- Jack Crowley - A criminal that was imprisoned in the Waterville State Prison for shooting Apu.
- Wolfguy Jack - The owner of Greaser's Cafe before it went out of business.
- Jack Tate - A comic book artist
- Jack Deforest - A boy transferred to Springfield Elementary, who got to the lead in the Casablanca school play along with Lisa.
- Jack Black - Guest starred in "Husbands and Knives" as Milo.
- Jack Sheldon - Guest starred in the episode "The Day the Violence Died", as the voice of the Amendment in the "Amendment to Be" clip.
- Jack Burns Guest Starred in the episode "Beyond Blunderdome" as Edward Christian.
Cast and Crew
- Jack Barth - A former writer on The Simpsons.