Mary Macdonald was a student attending Hogwarts School of Witchcraft and Wizardry at the same time as Lily Evans and Severus Snape. She was a Gryffindor, and was supposedly attacked with Dark Magic by Mulciber while at school. She alerted Lily to the fact that Snape was intending to spend the night outside the entrance to the Gryffindor common room to apologise for accidentally calling her a "Mudblood".
Appearances
- Harry Potter and the Deathly Hallows (Mentioned only)