Oldenburg is an independent city in the district of Oldenburg in the state of Lower Saxony, Germany. The city is officially named Oldenburg to distinguish from Oldenburg in Holstein.
During the French annexation in the wake of the Napoleonic war against Britain, it was also known as Le Vieux-Bourg in French. The city is at the rivers Hunte and Haaren, in the northwestern region between the cities of Bremen in the east and Groningen in the west. It has a population of 170,000. Oldenburg is part of the Bremen/Oldenburg Metropolitan Region, with 2.37 million people.
The city is the place of origin of the House of Oldenburg. Before the end of the German Empire, it was the administrative centre and residence of the monarchs of Oldenburg.