| Image Coa: | DEU Nienborstel COA.svg |
| Coordinates: | 54.1333°N 46°W |
| Image Plan: | Nienborstel in RD.png |
| State: | Schleswig-Holstein |
| District: | Rendsburg-Eckernförde |
| Amt: | Mittelholstein |
| Elevation: | 16 |
| Area: | 16.37 |
| Postal Code: | 24819 |
| Area Code: | 04871 + 04874 + 04875 |
| Licence: | RD |
| Gemeindeschlüssel: | 01 0 58 113 |
| Mayor: | Uwe Reimers |
Nienborstel is a municipality in the district of Rendsburg-Eckernförde, in Schleswig-Holstein, Germany.