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"So even if she's bewitched the door so Alohomora won't work, which I bet she has —"
— Harry Potter mentioning Dolores Umbridge's possible use of this charm[src]

The Anti-Alohomora Charm (incantation unknown) was an anti-unlocking charm, that acted as a counter-charm to the Unlocking Charm.[1][2]


This spell was invented by Blagdon Blay, sometime in the early 17th century. His house had been broken into nineteen times through use of the Unlocking Charm (Alohomora), and so he invented this spell to counteract it.[1]

Sometime before the 1986–1987 school year at Hogwarts School of Witchcraft and Wizardry, Merula Snyde and Tulip Karasu secured the door to Jacob's room with a special padlock enchanted with an Anti-Alohomora Charm that required two keys to open so that they could only access the room together.[3]

During the 1990–1991 school year, seventh-year students studied the Anti-Alohomora Charm in Charms class.[2]

During one of their many times breaking into Argus Filch's office, Jacob's sibling wondered why Mr Filch didn't secure his office with such a spell to prevent students from entering. They were unaware that Filch was a Squib and thus unable to do so.

Possible uses

Caster(s) Date Notes
Unknown 1926 May have been among the anti-unlocking charms placed on Percival Graves's office, as Queenie Goldstein unsuccessfully tried Alohomora to open it, along with Aberto.[4]
Filius Flitwick 1991–1992 Possibly placed this charm onto the third obstacle of the chambers that lead to the Philosopher's Stone during the 1991–1992 school year, as the door there could not be opened with the Unlocking Charm.[5]
Dolores Umbridge 1996 Harry Potter suspected that Dolores Umbridge, then Defence Against the Dark Arts professor, locked her office to prevent the Unlocking Charm from working, possibly referring to this charm.[6]


Notes and references

  1. 1.0 1.1 1.2 1.3 1.4 Wonderbook: Book of Spells
  2. 2.0 2.1 2.2 2.3 2.4 Harry Potter: Hogwarts Mystery, Year 7, Chapter 17 (An Infestation of Doxies) - Charms Lesson "Anti-Alohomora Charm"
  3. Harry Potter: Hogwarts Mystery, Year 3, Chapter 5 (Tulip Karasu)
  4. Fantastic Beasts and Where to Find Them: The Original Screenplay, Scene 70
  5. Harry Potter and the Philosopher's Stone, Chapter 16 (Through the Trapdoor)
  6. Harry Potter and the Order of the Phoenix, Chapter 29 (Careers Advice)
Charms (class)
PS Wingardium Leviosa feather.gif
Charm-book writers and developers
Blagdon Blay · Daisy Pennifold · Delfina Crimp · Miranda Goshawk · Jarleth Hobart · Basil Horton · Helixa Hyslop · Syna Hyslop · Randolph Keitch · Levina Monkstanley · Orabella Nuttley · Mnemone Radford · Scarpin · Elliot Smethwyck · Felix Summerbee · Violeta Stitch
Professors Fortinbras · Filius Flitwick · Unidentified 19th-century professor · Unidentified male professor
Textbooks Achievements in Charming · Extreme Incantations · Quintessence: A Quest · The Standard Book of Spells
Charms studied at Hogwarts
Anti-Alohomora Charm · Ascendio · Banishing Charm (Depulso) · Blackboard Writing Spell · Blue sparks · Box Blasting Charm (Cistem Aperio) · Bubble-Head Charm · Cheering Charm · Cleaning Charm · Colour Change Charm (Colovaria) · Confundus Charm (Confundo) · Counter-charm for hiccoughs · Dancing Feet Spell (Tarantallegra) · Descendo · Disarming Charm (Expelliarmus) · Disillusionment Charm · Drought Charm · Entrancing Enchantments (Theoretically) · Eradication Spell (Deletrius) · Engorgement Charm (Engorgio) · Extinguishing Spell · Exploding Charm (Bombarda) · Fire-Making Spell (Incendio) · Freezing Charm (Immobulus) · Freezing Spell (Glacius) · Full Body-Bind Curse (Petrificus Totalus) · General Counter-Spell (Finite Incantatem) · Gouging Spell (Defodio) · Growth Charm · Ice Jinx · Knitting Charm · Knockback Jinx (Flipendo) · Leg-Locker Curse (Locomotor Mortis) · Levitation Charm (Wingardium Leviosa) · Locking Spell (Colloportus) · Locomotion Charm (Locomotor) · Lumos Solem Spell (Lumos Solem) · Mending Charm (Reparo) · Memory Charm (Obliviate) · Muffliato Charm (Muffliato) · Nonverbal spells · Pack Charm (Pack) · Red Sparks (Vermillious) · Reductor Curse (Reducto) · Scouring Charm (Scourgify) · Seize and pull charm (Carpe Retractum) · Severing Charm (Diffindo) · Shrinking Charm (Reducio) · Silencing Charm (Silencio) · Slowing Charm (Arresto Momentum) · Skurge Charm (Skurge) · Softening Charm (Spongify) · Spell for growing legs · Substantive Charm · Summoning Charm (Accio) · Tickling Charm (Rictusempra) · Unlocking Charm (Alohomora) · Vinegar to wine spell · Wand-Extinguishing Charm (Nox) · Wand-Lighting Charm (Lumos) · Lumos Maxima · Water-Making Spell (Aguamenti)