1991

The following events occurred in the year 1991:

Events

 * Harry Potter finishes at his Muggle Primary School, at the age of ten.
 * Charlie Weasley and Nymphadora Tonks graduate from Hogwarts School of Witchcraft and Wizardry.
 * 23 June: For Dudley Dursley's eleventh birthday, his parents, cousin Harry Potter, and Piers Polkiss go to the zoo. Harry speaks Parseltongue for the first time to a boa constrictor.
 * 31 July: Quirinus Quirrell breaks into Gringotts Wizarding Bank, but fails to steal the Philosopher's Stone. Harry, on his eleventh birthday, goes to Diagon Alley for the first time with Rubeus Hagrid.
 * 1 September: Harry Potter and his classmates – including Ron Weasley, Hermione Granger, Neville Longbottom, and Draco Malfoy – begin at Hogwarts.
 * 12 September: Harry Potter becomes the youngest Seeker in a century for the Gryffindor Quidditch team.
 * 31 October: During the Halloween feast at Hogwarts, a mountain troll is let loose by Professor Quirrell, who looks for the Philosopher's Stone. Harry Potter and Ron Weasley save Hermione Granger from the troll, and the three become friends.
 * November: Harry plays his first Quidditch match.
 * 25 December: Harry receives his late father's Invisibility Cloak from Albus Dumbledore as a Christmas present. He also finds the Mirror of Erised and sees his family for the first time.

Gryffindor

 * Lavender Brown
 * Seamus Finnigan
 * Hermione Granger
 * Neville Longbottom
 * Parvati Patil
 * Harry Potter
 * Dean Thomas
 * Ronald Weasley

Hufflepuff

 * Ernie Macmillan
 * Hannah Abbott
 * Justin Finch-Fletchley
 * Leanne
 * Megan Jones
 * Susan Bones
 * Wayne Hopkins
 * Zacharias Smith

Ravenclaw

 * Anthony Goldstein
 * Kevin Entwhistle
 * Lisa Turpin
 * Mandy Brocklehurst
 * Michael Corner
 * Morag MacDougal
 * Padma Patil
 * Stephen Cornfoot
 * Su Li
 * Terry Boot

Slytherin

 * Blaise Zabini
 * Daphne Greengrass
 * Draco Malfoy
 * Gregory Goyle
 * Millicent Bulstrode
 * Pansy Parkinson
 * Theodore Nott
 * Tracey Davis
 * Vincent Crabbe
 * Another girl

Unknown

 * L. Moon
 * Rivers
 * Runcorn
 * Sally-Anne Perks
 * Spinks

Individuals who graduated from Hogwarts

 * Charles Weasley
 * Nymphadora Tonks

Births

 * Two little witches: twin sisters to unnamed wizarding couple.

Deaths

 * Arcturus Black III
 * Magenta Comstock
 * Perpetua Fancourt
 * Tilly Toke

Behind the scenes

 * 17 February: Bonnie Wright, the actress who portrays Ginny Weasley in the Harry Potter films, is born.
 * 16 August: Evanna Lynch, the actress who portrays Luna Lovegood in the Harry Potter films, is born.
 * 18 October: Toby Regbo, the actor who portrays a Young Albus Dumbledore in the Harry Potter films is born.
 * 13 January: Genevieve Gaunt, the actress who portrays Pansy Parkinson in the film adaptation of Harry Potter and the Prisoner of Azkaban, is born.