吹箭是一种管状武器，通过气息的力量将管中的箭吹出而达到攻击效果。中国古代归类于暗器的一种，称为吹箭筒。有时在弹药上毒液，效果更大。

吹箭是中南美洲热带雨林地区的许多美洲原住民部落常用的狩猎工具。另外，在日本的忍术中，吹箭（日语：吹き矢）也有应用。

A blowgun (also called a blowpipe or blow tube) is a simple weapon consisting of a small tube for firing light projectiles or darts.

The weapon is used by inserting the projectile inside the pipe (known as a blowgun) and using the force created by one's breath to give the projectile momentum. Its propulsive power is limited by the user's respiratory muscles.