The history of Dacian warfare spans from c. 10th century BC up to the 2nd century AD in the region defined by Ancient Greek and Latin historians as Dacia, populated by a collection of Thracian, Ionian, and Dorian tribes. It concerns the armed conflicts of the Dacian tribes and their kingdoms in the Balkans. Apart from conflicts between Dacians and neighboring nations and tribes, numerous wars were recorded among Dacians too.

Dacia was the land inhabited by the Dacians, its core in Transylvania, stretching to the Danube in the south, the Black Sea in the east, and the Tisza in the west. The Carpathian Mountains were located in the middle of Dacia. It thus roughly corresponds to present-day Romania, as well as parts of Moldova, Bulgaria, Serbia, Hungary, Slovakia, and Ukraine.