| Salzau | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Schleswig-Holstein |
| Subdivision Type3: | District |
| Subdivision Name3: | Plön |
| Subdivision Type4: | Reference no. |
| Subdivision Name4: | DE: 965529 |
| Length: | [1] |
| Source1 Location: | Selenter See |
| Mouth Location: | Passader See |
| Progression: | Hagener Au→ Baltic Sea |
| Custom Label: | References |
The Salzau is a stream, roughly long, in the district of Plön in the North German state of Schleswig-Holstein.
Together with the Mühlenau it is one of the two tailstreams of the lake known as the Selenter See. At its outlet into the Salzau near the district Fargau of Fargau-Pratjau, the water level of the lake can be controlled.[2] On its way to the Baltic Sea it flows into the Passader See. It leaves this as the Hagener Au, which after the last few metres discharges into the Baltic between Laboe and Stein.
The Salzau gives its name to the village of Salzau in the municipality of Fargau-Pratjau, whose manor house was called Schloss Salzau (Salzau Castle) locally and now houses the Salzau state cultural centre.