| Rodau | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Lower Saxony |
| Length: | 21.4km (13.3miles) |
| Source1 Location: | in near Visselhövede |
| Source1 Elevation: | 60 m |
| Mouth Location: | near Rotenburg an der Wümme into the Wiedau |
| Mouth Elevation: | 19.5 m |
| Progression: | Wiedau→ |
| Basin Size: | 142km2 |
| Custom Label: | References |
Rodau is a river of Lower Saxony, Germany. It is a left-hand tributary of the Wiedau.
The Rodau rises near, a borough of Visselhövede, in the district of Rotenburg an der Wümme at the foot of a 50adj=midNaNadj=mid ridge of end moraine that falls away to the northwest and dates to the Drenthe stage of the Saale glaciation. The river then crosses the densely wooded and near-natural Rosebruch in the area of the Samtgemeinde Bothel and discharges into the Wiedau at Rotenburg an der Wümme, before the Wiedau in turn enters the Wümme after only .
The Vissel joins the Rodau near Bothel. This stream rises in Visselhövede in one of the biggest springs in the Lower Saxon Plain and, at its mouth, carries around 25% more water than the Rodau, hence it is actually the main headstream of the Rodau.
The Rodau is a popular area with anglers and canoeists.