The Japanese Ashigaru (足軽) were foot-soldiers of medieval Japan. During Muromachi period, Ashigaru were employed by Shogun as his personal army.

Their root is belived to be that of "Shimobe" (下部) who served by the side of government officials during Heian period. Ashigaru (lit "light-foot" but most likely stems from "light armored") were the lowest-class warriors, either the low-class buke (noble) or commoners who had joined or been impressed to the daimyo's army. There are also stories about female ashigaru, though it is unlikely that they served in the frontline duty.

The ashigaru were foot soldiers - the cavalry was the territory of the samurai. They might have been armed with katana or just with spears unless they served as handlers of catapults. In the 1500's, they were also armed with arquebuses. As battles became more complex and forces larger, ashigaru were rigorously trained so that they would hold their ranks in the face of enemy fire. Their armor consisted of conical hats (jingasa) made of lacquered hardened leather, breastplates and occasionally greaves protecting the legs. Some also donned small banners on their back during battle for identification purposes, called "sashimono." They needed to bring provisions for themselves until reaching local gathering points and from this point on, were provided provisions from daimyo's warehouses.

At first the ashigaru were mercenaries or adventurers who were paid only in loot but eventually some of them became part of local armies as retained warriors. Those who were given control of ashigaru were called Ashigarugashira (足軽頭), lit. ashigaru head and were provided with 200 to 500 koku.

In the Onin War, ashigaru gained a reputation as unruly troops when they looted and burned Miyako (modern-day Kyoto). In the following Sengoku period some of them rose to greater prominence. The most famous of them was Toyotomi Hideyoshi, who also raised many of his warrior followers to samurai status. Yamauchi Katsutoyo was one of such samurai and later daimyo who rose from ashigaru.