A hood is a kind of headgear that covers most of the head and neck and sometimes the face. They may be worn for protection from the environment, for fashion, as a form of traditional dress or uniform, to prevent the wearer from seeing or to prevent the wearer from being identified.

Historically, hoods were either similar to modern hoods, often forming part of a cloak or cape, or a separate form of headgear. Hoods with short capes, called chaperons in French, were extremely common in medieval Europe, and later evolved into extravagant hats. Soft hoods were worn by men under hats. Hoods have also been used as part of uniforms for organizations such as the Ku Klux Klan.

A hood to hide or control the wearer often covers the whole head, with the result that the wearer can see little or nothing, like a blindfold, or it can be to prevent identification of the wearer. It may be used on or by a person who has been arrested or kidnapped, or about to suffer judicial execution; this practice is known as hooding. The hood may be simply a bag; it may be intended to be, and/or experienced as, humiliating (see hood event).

Hood may refer to:

Headgear, headwear or headdress is the name given to any element of clothing which is worn on one's head.

Headgear serve a variety of purposes:

Bonnets, as worn by women and girls, were hats worn outdoors which were secured by tying under the chin, and often which had some kind of peak or visor. Some styles of bonnets had peaks so large that they effectively prevented women from looking right or left without turning their heads. Bonnets worn by men and boys are generally distinguished from hats by being soft and having no brim—this usage is now rare (they would normally be called caps today, except in Scotland where the "bunnet" is common in both civilian life and in the Royal Regiment of Scotland).

Caps are generally soft and often have no brim or just a peak (like on a baseball cap). For many centuries women wore a variety of head-coverings which were called caps. For example, in the 18th and 19th centuries a cap was a kind of head covering made of a flimsy fabric such as muslin; it was worn indoors or under a bonnet by married women, or older unmarried women who were "on the shelf" (e.g. mob-cap). An ochipok is part of traditional Ukrainian costume.