- "Harry pointed his wand hastily at the door of Madam Pomfrey's office and muttered, "Muffliato!" so that she would not come running."
- —Harry Potter using this spell in the hospital wing[src]
Muffliato is a charm that fills a surrounding area with an unidentifiable buzzing so to provide a private environment for a conversation in a public place. The caster may have lengthy, intimate conversations without being overheard. It was invented by Severus Snape while he was a student at Hogwarts School of Witchcraft and Wizardry.
It is possible, given that when Harry Potter was shouting at his friends in an area that was protected by this spell and ravens flew up in shock when he began yelling, that the charm only works on humans.
Hermione Granger originally disapproved of using the spell, but came to use it herself when it was needed; for example, to protect the campsites she shared with Harry Potter and Ron Weasley when they hunted for Lord Voldemort's Horcruxes between 1997-1998.
- The English word muffle means "to make a sound less distinct by covering its source."