Jack may refer to:
- Jack (crush), a character from the book Little Vampire's Diary, a boy to whom Plaxie Wishbone is attracted
- Jack Smith, a character mentioned in the episode "The Skeleton Cowboy" of the television series
- Jack Feffer, a character from the episode "Jack out of the box" of the television series, the primary antagonist of the episode
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- For more uses of Jack, especially those disregarding the Mona the Vampire franchise, see Jack (disambiguation) on Wikipedia.