This is an article, focusing a disambiguation of "Jack".
- Jack-the Nobody of Wolf's Tale
- Jack-Jack-a character originally from The Incredibles; he makes a cameo of Kingdom Hearts: Dream Worlds
- Jack Frost-a character originally from Rise of the Guardians, and appears in Kingdom Hearts: Heartache as the 2nd Starlight Prince
- Jack Knife-a character originally from Wild Grinders, and one of main characters of a fan spin-off, Techno Fantasy
- Jack of Spades-a character from Nightverse
- Jack Skellington (KHDW)-a character originally from The Nightmare Before Christmas; he makes a cameo of Kingdom Hearts: Dream Worlds.
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