| Krückau | |
| Mouth Coordinates: | 53.7144°N 9.5118°W |
| Subdivision Type1: | Country |
| Subdivision Type2: | State |
Krückau is a river in the federal state of Schleswig-Holstein in the north of Germany. It flows into the river Elbe near Seestermühe. The lower part between the Elbe and Elmshorn is navigable but not classified.[1]