Mary is a given name that can refer to:
- Mary II, the Queen of England in the 1600s
- Mary Cattermole, a Muggle-born and wife of Reginald Cattermole
- Mary Dorkins, a Muggle television reporter
- Mary Doyle, a student at Hogwarts in the 1990s
- Mary Macdonald, a Gryffindor student at Hogwarts in the 1970s
- Mary Riddle, the mother of Tom Riddle Sr
Behind the scenes
Real-world individuals with the given name Mary include:
- Mary Epworth: is an English musician who fronts the psychedelic rock group Mary Epworth and the Jubilee Band
- Mary GrandPré, an illustrator for the Harry Potter books
- Mary O'Mahony, plays an extra in the film adaptations of Harry Potter and the Deathly Hallows.