Muggle-Repelling Charm

• Incantation: Unknown
• Pronunciation: Not applicable
• Wand Movement: Unknown
• Light: None described
• Effect: Causes Muggles who approach a magically concealed area to feel a strong aversion to it. They will typically remember a sudden, urgent appointment or reason to be elsewhere, prompting them to turn back without realizing they have been magically influenced.
• Type: Charm

The Muggle-Repelling Charm is a common and highly useful enchantment for concealing magical locations and events from the non-magical community. It does not render a place invisible but instead affects the minds of any Muggles who venture too close. Known uses in the series include:

• Hogwarts School of Witchcraft and Wizardry: The entire castle and grounds are enchanted with numerous spells, including strong Muggle-Repelling Charms. As explained by Hermione Granger, if a Muggle were to look at the school, they would only see a moldering old ruin with a sign reading “DANGER, DO NOT ENTER, UNSAFE.”
• Quidditch World Cup Stadium: The stadium for the 1994 Quidditch World Cup, along with the associated campsite, was protected by Muggle-Repelling Charms to allow hundreds of thousands of wizards to gather undetected. The Muggle campsite manager, Mr. Roberts, was an exception and required repeated use of the Memory Charm.
• St Mungo's Hospital for Magical Maladies and Injuries: The magical hospital is located within a “condemned” London department store called Purge and Dowse Ltd. The building is designed to be unappealing, and Muggle-Repelling Charms ensure that non-magical people studiously ignore it.
• Number Twelve, Grimmauld Place: While principally protected by the powerful Fidelius Charm, the headquarters of the Order of the Phoenix was also layered with Muggle-Repelling Charms. These enchantments contributed to the local Muggles' long-held belief that the houses on the square simply jump from number eleven to number thirteen.
• Campsite Protection: During the hunt for Lord Voldemort's Horcruxes, Hermione Granger regularly cast Muggle-Repelling Charms as part of a suite of protective enchantments around the trio's campsite each night. This was crucial for keeping their location secret from Muggles and any Death Eaters or Snatchers in the area.

The specific difficulty of learning the Muggle-Repelling Charm is not stated in the novels. However, its competent and regular use by Hermione Granger starting in her seventh year suggests it is an advanced but achievable spell for a skilled student, likely covered in upper-level Charms or Defence Against the Dark Arts studies. There is no known counter-spell or method to bypass the charm's effects for a Muggle. The charm is specifically designed to affect non-magical people, while witches and wizards are immune to its influence and can enter protected areas freely.

The name of the charm is purely descriptive and does not have a known Latin-based incantation.

• Muggle: The established wizarding term for a person born with no magical ability.
• Repel: A verb meaning “to drive or force an attack or attacker back or away.”

The name directly and accurately describes the charm's primary function: to repel Muggles from a specific location.

• In the film adaptation of Harry Potter and the Deathly Hallows: Part 1, the protective enchantments cast by Hermione Granger around the campsite are depicted as a visible, shimmering magical dome. This visual effect represents a combination of spells, including the Muggle-Repelling Charm, `Protego Totalum`, `Salvio Hexia`, and `Cave Inimicum`. (film)
• The supplementary ebook Hogwarts: An Incomplete and Unreliable Guide reinforces the canonical information that Muggles perceive Hogwarts as nothing more than a dangerous, dilapidated ruin. (Pottermore)