1991 was the eighth-to-last year in the twentieth century, and the first year in the 1990s.
The following events occurred in 1991:
- Harry Potter and his contemporaries were Sorted at Hogwarts School of Witchcraft and Wizardry.
- The Philosopher's Stone was removed from Vault 713 in Gringotts Bank and moved to the third-floor corridor at Hogwarts School of Witchcraft and Wizardry.
- Quirinus Quirrell met Voldemort in a dark forest in Albania; Voldemort possessed him and the two spent the rest of the year drinking unicorn blood and trying to steal the Philosopher's Stone.
- Quirrell died, and Voldemort fled back to Albania, deeply enfeebled. The Philosopher's Stone was destroyed and Nicolas and Perenelle Flamel died.