The Duchy of Bavaria was a frontier region in the southeastern part of the Merovingian kingdom from the sixth through the eighth century. It was settled by Bavarian tribes and ruled by dukes (duces) under Frankish overlordship. A new duchy was created from this area during the decline of the Carolingian Empire in the late ninth century. It became one of the stem duchies of the East Frankish realm which evolved as the Kingdom of Germany and the Holy Roman Empire.

Bavarians are an ethnographic group of Germans of the Bavaria region, a state within Germany. The group's dialect or speech is known as the Bavarian language, native to Altbayern, roughly the territory of the Electorate of Bavaria in the 17th century.