| Rantzau | |
| Image Coa: | Rantzau Wappen.svg |
| Coordinates: | 54.25°N 41°W |
| Image Plan: | Rantzau in PLOE.png |
| State: | Schleswig-Holstein |
| District: | Plön |
| Amt: | Großer Plöner See |
| Elevation: | 39 |
| Area: | 16.91 |
| Postal Code: | 24329 |
| Area Code: | 04383 |
| Licence: | PLÖ |
| Gemeindeschlüssel: | 01 0 57 065 |
| Website: | www.amt-grosser- ploener-see.de |
| Mayor: | Hans-Peter Asbahr |
Rantzau is a municipality in the district of Plön, in Schleswig-Holstein, Germany.