The kepi is a cap with a flat circular top and a visor. The word came into the English language from French, in which it is written with an acute accent: képi.

It is the most common headgear in the French Army and the French Gendarmerie – particularly, the French Foreign Legion, whose members are sometimes called Képis blancs ("white kepis"), because of the the unit's regulation white headgear. In the United States it is most often associated with the American Civil War era, and into the Indian Wars.