| Gölsen | |
| Mouth Location: | The Traisen River at Traisen. |
| Mouth Coordinates: | 48.052°N 15.612°W |
| Progression: | Traisen→ |
| Subdivision Type1: | Country |
| Subdivision Name1: | Austria |
| Length: | 15.7km (09.8miles) |
| Source1 Elevation: | 439m (1,440feet) |
| Basin Size: | 297km2 |
The Gölsen is a river in Lower Austria, in the Mostviertel. It is a right tributary of the Traisen. Its drainage basin is .[1]
The river begins in Hainfeld with the confluence of the Fliedersbach and the Ramsaubach (also called the Innere Gölsen). It then flows through the communities of Hainfeld, Rohrbach an der Gölsen, and Sankt Veit an der Gölsen, before discharging into the Traisen at Traisen. The Gölsen flows in an east-west direction and is around long, it has a difference in elevation of .
The river is nowadays heavily obstructed due to its recurring floods (Gölsen Dam, On account of its recurrent floods, the Gölsen is nowadays carefully controlled (the Gölsen Dam, river bed steps). However, within its broad riverbed, it can form gravel banks.
Parallel to the river runs the so-called German: Gölsentalradweg ("Gölsen valley bike trail"), which runs from the German: Traisentalradweg to Hainfeld. An extension of the path to the Triesting Valley Cycle Way is planned.
Parallel to the river, the so-called German: Gölsentalradweg ("Gölsen valley bike trail") was laid out, which runs continuously on asphalt from the German: Traisentalradweg to Hainfeld and then on into the valley of the Triesting to the German: Triestingtalradweg.
Along the Gölsen runs a rail line, the from Traisen to Hainfeld. In the past, the line was longer and continued to Kaumberg and farther into the Triesting valley. Since 2004, however, only special trains have operated on this section of line.