| Tielenau | |
| Source1 Coordinates: | 54.2313°N 9.2607°W |
| Mouth Coordinates: | 54.2801°N 9.3404°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
Tielenau is a river of Schleswig-Holstein, Germany.
The Tielenau springs north of Westerborstel. It is a left tributary of the Eider south of Erfde.