Jack is a given name that can refer to:
- Jack, a boy who lived during the Middle Ages
- Jack Sloper, a Beater on the Gryffindor Quidditch team in the 1990s
- Jack Monk, one of a set of twins born to muggles Dave and Tilly Monk under precarious circumstances.
Behind the scenes
Real-world individuals with the given name Jack include:
- Jack Bagley, a British actor who played a Hogwarts student in the film adaptation of Harry Potter and the Goblet of Fire
- Jack Pryor, an actor who portrayed a waiter in the film adaptation of Harry Potter and the Half-Blood Prince
- Jack Saunders, provided the voice for a Hufflepuff student in the video game adaptation of Harry Potter and the Half-Blood Prince