| Image Coa: | DEU Groß Rönnau COA.svg |
| Coordinates: | 53.9667°N 29°W |
| Image Plan: | Groß Rönnau in SE.svg |
| State: | Schleswig-Holstein |
| District: | Segeberg |
| Amt: | Trave-Land |
| Elevation: | 32 |
| Area: | 6.38 |
| Postal Code: | 23795 |
| Area Code: | 04551 |
| Licence: | SE |
| Gemeindeschlüssel: | 01 0 60 030 |
| Website: | www.amt-trave- land.de |
| Mayor: | Joachim Rathje |
Groß Rönnau is a municipality in the Kreis (district) of Segeberg in Schleswig-Holstein, north Germany.