| Grabau | |
| Image Coa: | DEU Grabau (Lauenburg) COA.svg |
| Coordinates: | 53.5144°N 10.5208°W |
| Image Plan: | Grabau in RZ.svg |
| State: | Schleswig-Holstein |
| District: | Herzogtum Lauenburg |
| Amt: | Schwarzenbek-Land |
| Elevation: | 38 |
| Area: | 4.1 |
| Postal Code: | 21493 |
| Area Code: | 04151 |
| Licence: | RZ |
| Gemeindeschlüssel: | 01 0 53 036 |
| Website: | www.amt-schwarzenbek-land.de |
| Mayor: | Bernd Granzow |
Grabau is a municipality in the district of Lauenburg, in Schleswig-Holstein, Germany.