Kreiensen is a village and a former municipality in the district of Northeim, in Lower Saxony, Germany.
The Altenbeken–Kreiensen railway is part of a former long-distance route in Germany from the Ruhr area via Altenbeken, Ottbergen, Holzminden, Kreiensen and Seesen towards Berlin.
The first test runs were made 25 September 1930 on the track Braunschweig-Paderborn between Kreiensen and Altenbeken.