A horse archer, horsed archer, or mounted archer is a cavalryman armed with a bow, able to shoot while riding from horseback. Archery has occasionally been used from the backs of other riding animals. Mounted archery was a defining characteristic of Steppe warfare throughout Central Asia, and throughout the prairies of America after the adoption of the horse, used by peoples including the Scythians, Sarmatians, Parthians, Sassanids, Huns, Byzantines, Bulgars, Cumans, Kipchaks, Magyars, Japanese, Mongols, Turks, Russians, Rajputs, Comanches, and others.

It was also adopted by other peoples and armies, notably Chinese and Romans who both suffered serious conflict with peoples practising horse archery. It developed separately among the peoples of the South American pampas and the North American prairies