The Brunswick–Bad Harzburg railway is a 47 km long German main line railway in the northern foothills of the Harz. It is one of the oldest lines in Germany and the first government-owned railway in Germany.

Braunschweig or Brunswick is a city in Lower Saxony, Germany, north of the Harz Mountains at the farthest navigable point of the river Oker, which connects it to the North Sea via the rivers Aller and Weser. In 2016, it had a population of 250,704.