Bergen is a town in the north of Celle district on the Lüneburg Heath, in Lower Saxony, Germany. Administratively it acts as a municipal borough divided into 12 subordinate parishes based on the town and its surrounding villages: Becklingen, Belsen, Bergen, Bleckmar, Diesten, Dohnsen, Eversen, Hagen, Hassel, Offen, Sülze and Wardböhmen. Bergen-Belsen concentration camp was located in the area of Belsen.
The town had 13,099 inhabitants according to the census conducted in December 2008. Members of the British military and their families, who were not included in the census, bring the actual population to about 17,000. These soldiers occupy a NATO base and exercise on the Bergen-Hohne Training Area just outside the town. The Sieben Steinhäuser, a cluster of dolmens dating from the Stone Age, are located within the training area.