The naginata is a polearm and one of several varieties of traditionally made Japanese blades (nihontō). Naginata were originally used by the samurai class of feudal Japan, as well as by ashigaru and sōhei. The naginata is the iconic weapon of the onna-musha, a type of female warrior belonging to the Japanese nobility. A common misconception is that the Naginata is a type of sword, rather than a polearm.

A polearm or pole weapon is a close combat weapon in which the main fighting part of the weapon is fitted to the end of a long shaft, typically of wood, extending the user's effective range and striking power. Polearms are predominantly melee weapons, with a subclass of spear-like designs fit for thrusting and/or throwing. Because many polearms were adapted from agricultural implements or other fairly abundant tools, and contained relatively little metal, they were cheap to make and readily available. When belligerents in warfare had a poorer class who could not pay for dedicated military weapons, they would often appropriate tools as cheap weapons. The cost of training was comparatively low, since these conscripted farmers had spent most of their lives using these "weapons" in the fields. This made polearms the favoured weapon of peasant levies and peasant rebellions the world over.