| Image Coa: | DEU Harmstorf COA.svg |
| Coordinates: | 53.35°N 68°W |
| Image Plan: | Harmstorf in WL.svg |
| State: | Niedersachsen |
| District: | Harburg |
| Samtgemeinde: | Jesteburg |
| Elevation: | 15 |
| Area: | 5.97 |
| Postal Code: | 21228 |
| Area Code: | 04105 |
| Licence: | WL |
| Gemeindeschlüssel: | 03 3 53 017 |
| Website: | Gemeinde Harmstorf |
| Mayor: | Andreas Maack |
Harmstorf is a municipality in the district of Harburg, in Lower Saxony, Germany.