| Söse | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Lower Saxony |
| Subdivision Type3: | Reference no. |
| Subdivision Name3: | DE: 48828 |
| Length: | 37.8km (23.5miles) |
| Source1 Location: | Auf dem Acker in the Harz |
| Source1 Elevation: | ca. |
| Mouth Location: | Into the Rhume near Katlenburg-Lindau |
| Basin Landmarks: | Large towns: Osterode |
| Basin Size: | 213km2 |
| Discharge1 Location: | at Riefensbeek gauge |
| Discharge1 Min: | Record low: (in 20.08.2003) Average low: |
| Discharge1 Max: | Average high: Record high: (in 01.08.1967) |
| Tributaries Right: | Große Bremke, Sülpkebach, Markau |
| Tributaries Left: | Alte Söse |
| Waterbodies: | Reservoirs: Söse Reservoir |
| Custom Label: | References |
Söse is a river of Lower Saxony, Germany. It is a right tributary of the river Rhume and long.
The Söse rises on the plateau of Auf dem Acker in the district of Göttingen in the southwestern part of the Harz Mountains in Germany. From there it flows initially westwards; and is then impounded at a pre-dam and then by the Söse Dam between the Osterode village of Riefensbeek and the town of Osterode itself. In Osterode the river bends northwest, only to swing westwards near Badenhausen and then southwards near Eisdorf just a few kilometres west of the Harz. It flows in that direction through Osterode-Dorste before entering the westward-flowing Rhume between the villages of and, both part of the borough of Katlenburg-Lindau in the district of Northeim.
At the confluence of the Great Söse and the Great Morgenbrod is the Morgenbrodt Hut (ca. 600 bis ; ). This spot is no. 148[1] in the system of checkpoints in the Harzer Wandernadel hiking network. The Morgenbrodt Hut was demolished in 2013 by the National Park Authority as it was falling down and it is not intended to be replaced.[2]