The army of [[ancient Macedon is considered to be among the greatest military forces of the ancient world. It became the formidable force known from history first under the rule of King Philip II of Macedonia and then his son, Alexander the Great.

The military innovations, both in weapons and tactics, brought forth by Philip II of Macedonia were what truly forged the army that conquered an empire. He turned warfare and combat into a way of life for the Macedonians, who until then had treated the military as a part-time occupation to be pursued during the off-season from farming. By introducing the military as a full-time occupation, Philip II of Macedonia was able to drill his men regularly, building unity and cohesion. This created the finest military machine that Asia or Greece had ever seen, thanks to the amount of time and effort spent on maneuvers as well as military innovations.

Tactical innovations included the effective use of the phalanx, as well as coordinated attacks and tactics between his phalanx infantry units, cavalry, archers, and siege engines. Weapons introduced included the sarissa, or long pike, which created many advantages, both offensively and defensively, for the Macedonian Army.