Lutter am Barenberge is a market town (Flecken) and a former municipality in the Goslar district of Lower Saxony, Germany. Since 1 November 2021, it is part of the town Langelsheim, of which it is an Ortschaft. It was the administrative seat of the former Samtgemeinde ("collective municipality") Lutter am Barenberge

It is situated between the Harz mountain range in the south and the Hainberg hills in the north, approx. 13 km (8 mi) northwest of Goslar. The municipal area comprises the localities of Nauen and Ostlutter.

Lutter, named after a nearby creek, was founded by Emperor Otto I in 956 as a part of the Gandersheim Abbey estates within the Duchy of Saxony. A water castle was first mentioned in 1259, leased by the Bishops of Hildesheim to local nobles. In various times, it was claimed by the Dukes of Brunswick-Lüneburg, but re-acquired by the Hildesheim bishops in 1323. Thereupon the denotation Bischofslutter appeared in order to differ it from nearby Königslutter. The name Lutter am Barenberge (i.e. the Harz mountains) is documented since the 14th century.

In the fierce Hildesheim Diocesan Feud of 1523, Lutter was again conquered by Duke Henry V of Brunswick and the Hildesheim prince-bishop John IV of Saxe-Lauenburg could only retain the locality of Ostlutter. During the Thirty Years' War, the Danish troops under King Christian IV retired to Lutter Castle, where they were defeated by Imperial and Catholic forces led by Count Tilly in the 1626 Battle of Lutter, a rout that changed the course of the Thirty Years' War.

According to the Final Act of the Vienna Congress, the former Hildesheim estates of Ostlutter in 1815 passed to the Kingdom of Hanover (Prussian Province of Hanover from 1866), while Lutter proper remained with the Duchy of Brunswick. Both parts were not re-united until an administrative reform of 1941.

As of 30 June 2020 there were 2,296 inhabitants in the municipality Lutter am Barenberge, of which 1,583 in Lutter am Barenberge proper, 313 in Nauen and 400 in Ostlutter.

Year Inhabitants 1821 1,840 1848 2,557 1871 2,618 1885 2,721 1905 2,558 1925 2,205

Year Inhabitants 1933 2,245 1939 2,209 1946 3,873 1950 3,795 1956 3,197

Year Inhabitants 1961 2,956 1968 2,792 1970 2,812 1975 2,681 1980 2,588

Year Inhabitants 1985 2,584 1990 2,612 1995 2,541 2000 2,529 2005 2,409

• Notgeld (emergency banknotes) for the town of Lutter am Baranberge depicting King Christian IV's retreat after the Battle of Lutter. http://webgerman.com/Notgeld/Directory/L/Lutter.htm