| Siek | |
| Image Coa: | DEU Siek (Holstein) COA.svg |
| Coordinates: | 53.6344°N 10.2981°W |
| Image Plan: | Siek in OD.svg |
| State: | Schleswig-Holstein |
| District: | Stormarn |
| Amt: | Siek |
| Elevation: | 57 |
| Area: | 12.47 |
| Postal Code: | 22962 |
| Area Code: | 04107 |
| Licence: | OD |
| Gemeindeschlüssel: | 01 0 62 069 |
| Website: | www.amtsiek.de |
| Mayor: | Hans-Peter Rönner |
| Party: | CDU |
Siek is a municipality in the district of Stormarn in Schleswig-Holstein, Germany. It is situated approximately 6km (04miles) southeast of Ahrensburg, and 24km (15miles) northeast of Hamburg.
Siek is the seat of the Amt ("collective municipality") Siek.