| Thumby Tumby | |
| Image Coa: | DEU Thumby COA.svg |
| Coordinates: | 54.5667°N 64°W |
| Image Plan: | Thumby in RD.png |
| State: | Schleswig-Holstein |
| District: | Rendsburg-Eckernförde |
| Amt: | Schlei-Ostsee |
| Elevation: | 25 |
| Area: | 27.39 |
| Postal Code: | 24351 |
| Area Code: | 04352, 04355 |
| Licence: | RD |
| Gemeindeschlüssel: | 01 0 58 162 |
| Website: | www.amt-schlei- ostsee.de |
| Mayor: | Christian Rehm |
Thumby (Danish: Tumby) is a municipality in the district of Rendsburg-Eckernförde, in Schleswig-Holstein, Germany.