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The Nopperabō (のっぺらぼう or のっぺら坊Noppera-bō?), or faceless ghost, is a Japanese legendary creature. They are sometimes mistakenly referred to as a mujina, an old Japanese word for a badger or raccoon dog. Although the mujina can assume the form of the other, nopperabō are usually humans. Such creatures were thought to sometimes transform themselves into nopperabō in order to frighten humans. Lafcadio Hearn used the animals' name as the title of his story about faceless monsters, probably resulting in the misused terminology.
Nopperabō are known primarily for frightening humans, but are usually otherwise harmless. They appear at first as ordinary human beings, sometimes impersonating someone familiar to the victim, before causing their features to disappear, leaving a blank, smooth sheet of skin where their face should be.