"Harry aimed his wand at Peeves and said, "Langlock!" Peeves clutched at his throat, gulped, then swooped from the room making obscene gestures but unable to speak, owing to the fact that his tongue had just glued itself to the roof of his mouth."
—Harry Potter's use on Peeves the Poltergeist in the Hogwarts hospital wing[src]

Langlock[2] is the incantation of a jinx that causes one's tongue to affix to the roof of their mouth. It is known to work on humans[1] as well as on spirits (including a poltergeist, like Peeves).[2] It was most likely invented for the sake of preventing someone from speaking aloud or even to prevent a spell from being cast.


It was invented by Severus Snape and recorded in his copy of Advanced Potion-Making while he was a student at Hogwarts School of Witchcraft and Wizardry in the 1970s.[3]

William Weasley taught this jinx to sixth year students at Hogwarts during the 1989–1990 school year.[5]

Harry Potter found out about the spell in the 1996-1997 school year when he gained possession of Snape's copy of Advanced Potion-Making. He used Langlock on Argus Filch twice during the school year "to general applause",[1] and again on Peeves.[2]

Known practitioners

Behind the scenes

See also


The word langue is the root for tongue, while lock is an English word.


Notes and references

  1. 1.0 1.1 1.2 1.3 1.4 Harry Potter and the Half-Blood Prince, Chapter 12 (Silver and Opals)
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Harry Potter and the Half-Blood Prince, Chapter 19 (Elf Tails)
  3. 3.0 3.1 3.2 Harry Potter and the Half-Blood Prince - Chapter 12 (Silver and Opals) - "Harry had already attempted a few of the Prince’s self-invented spells."
  4. 4.0 4.1 Pottermore - All about... Severus Snape
  5. 5.0 5.1 Harry Potter: Hogwarts Mystery, Year 6, Chapter 10 (Cloaks and Conflicts) - Defence Against the Dark Arts Lesson "Langlock"
  6. Harry Potter and the Goblet of Fire - Chapter 27 (Padfoot Returns)
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