Old Saxony was the homeland of the Saxons during the Early Middle Ages. It corresponds roughly to the modern German states of Lower Saxony, eastern part of modern North Rhine-Westphalia state (Westphalia), Nordalbingia and western Saxony-Anhalt (Eastphalia), which all lie in northwestern Germany. It had four provinces: Nordalbingia, Eastphalia, Westphalia and Angria, these provinces, in turn, were divided into smaller territories, the gaue, which are equivalent to modern Districts of Germany (Kreise), and were equivalent to the English shires.

The Saxons were a group of Germanic peoples whose name was given in the early Middle Ages to a large country near the North Sea coast of northern Germania, in what is now Germany. In the late Roman Empire, the name was used to refer to Germanic coastal raiders, and in a similar sense to the later "Viking". Their origins are believed to be in or near the German North Sea coast where they appear later, in Carolingian times. In Merovingian times, continental Saxons had been associated with the activity and settlements on the coast of what later became Normandy. Their precise origins are uncertain, and they are sometimes described as fighting inland, coming into conflict with the Franks and Thuringians. There is possibly a single classical reference to a smaller homeland of an early Saxon tribe, but its interpretation is disputed. According to this proposal, the Saxons' earliest area of settlement is believed to have been Northern Albingia. This general area is close to the probable homeland of the Angles.