A mask is an object worn on the face, typically for protection, disguise, performance, or entertainment. Masks have been used since antiquity for both ceremonial and practical purposes, as well as in the performing arts and for entertainment.

They are usually worn on the face, although they may also be positioned for effect elsewhere on the wearer's body.

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The word "mask" appeared in English in the 1530s, from Middle French masque "covering to hide or guard the face", derived in turn from Italian maschera, from Medieval Latin masca "mask, specter, nightmare".

Masks are sometimes used to avoid recognition. As a disguise the mask acts as a form of protection for the wearer who wishes to assume a role or task without being identified by others.