The following events occurred in the year 1990:
- 1 September: Katie Bell, Cormac McLaggen, Cho Chang and Marietta Edgecombe begin attending Hogwarts School of Witchcraft and Wizardry and are sorted into Gryffindor and Ravenclaw, respectively.
- Cornelius Fudge becomes Minister for Magic.
- The 421st Quidditch World Cup is held. After a five-day-long final, Canada defeats Scotland. In a post-match interview, Scottish Seeker Hector Lamont famously blames his father, "Stubby" Lamont, for not giving him longer fingers.
- Charity Burbage becomes the new Muggle Studies Professor after Quirinus Quirrell quits.
- Pollux Black, grandfather of Sirius Black III, dies.
- Mrs. Lovegood, Luna Lovegood's mother, dies in a freak-accident.
Behind the scenes
- 13 February: Tom Moorcroft, who portrayed Regulus Black, is born.
- 28 February: Georgina Leonidas, who plays Gryffindor student Katie Bell, is born.
- 15 April: Actress Emma Watson, who portrays Hermione Granger in the Harry Potter films, is born to Jaqueline Luesby and Chris Watson.
- 6 October: Actress Scarlett Byrne, who portrays Pansy Parkinson in the film version of Harry Potter and the Half-Blood Prince, is born.