Also the old form Heinberg) is a hill range, up to 299 metres high,[1] northwest of the Harz Mountains in the eastern part of Lower Saxony, Germany.

It is located in the centre of the im Zentrum des Innerste Uplands, a northeastern section of the Lower Saxon Hills, several kilometres southwest of the town of Salzgitter and borders on the Ambergau to the east.

The Hainberg runs from Holle in the north-northwest and Baddeckenstedt to the north Norden and east to Lutter am Barenberge in the south.

Several tributary streams of the Innerste and Nette rise on its slopes and it is crossed by several hiking trails and forest tracks.

200 to 283 m above sea level (NN)), which are made of sandstone and run for about 3 km through the southern part of the Hainberg.