The yumi, or Japanese longbow, is a large bow and arrow that was a favorite of weapon of the Samurai of feudal Japan. The weapon holds the distinction of being the longest bow in the world, longer even than the longbow.

The bow is typically about two meters in length, longer than the archer is tall. The weapon is gripped asymmetrically, with the grip two thirds of the way up the bow. The yumi is traditionally made from a composite of wood and bamboo, though in the modern era, synthetic yumi are sometimes used for sport archery.

The traditional wood and bamboo construction, combined with its great length, allows the bow to store large amounts of energy on the draw and release it with great force, giving a range of over 100 meters in the hands of a skilled archer. While the yumi is powerful, like all traditional bows, it has the drawback of taking years to master, leading to its partial replacement with the tanegashima musket once firearms were introduced by the Portuguese in the mid-1500s.