The Germania, written by the Roman historian Publius Cornelius Tacitus around 98 AD and originally entitled On the Origin and Situation of the Germans, is a historical and ethnographic work on the Germanic peoples outside the Roman Empire.

Germania, also called Magna Germania, Germania Libera, or Germanic Barbaricum to distinguish it from the Roman province of the same name, was a historical region in north-central Europe during the Roman era, which was associated by Roman authors with the Germanic people. The region stretched roughly from the Middle and Lower Rhine in the west to the Vistula in the east. It also extended at some point as far south as the Upper and Middle Danube and Pannonia, and to the known parts of southern Scandinavia in the north. Archaeologically, these people correspond roughly to the Roman Iron Age of those regions. While dominated by Germanic people, Magna Germania was also inhabited by a few other Indo-European people.