| Image Coa: | DEU Klempau COA.svg |
| Coordinates: | 53.7667°N 50°W |
| Image Plan: | Klempau in RZ.svg |
| State: | Schleswig-Holstein |
| District: | Herzogtum Lauenburg |
| Amt: | Berkenthin |
| Elevation: | 15 |
| Area: | 10.07 |
| Postal Code: | 23628 |
| Area Code: | 04508 |
| Licence: | RZ |
| Gemeindeschlüssel: | 01 0 53 067 |
| Website: | www.amt- berkenthin.de |
| Mayor: | Karl Bartels |
Klempau is a municipality in the district of Lauenburg, in Schleswig-Holstein, Germany. It is located south of the city of Lübeck and west of Ratzeburger See.