Ballaios was an Illyrian king of the Ardiaei tribe. Attested only in coinage, Ballaios is considered as the predecessor of Agron. He is considered to have been a powerful and influential king as testified by the abundance of his silver and bronze coinage found along both coasts of the Adriatic. A hoard found in 2010 is one of the biggest hoards of ancient coins known, not only from Illyria. The capital of Ballaios' kingdom was Rhizon.