| Coordinates: | 52.2575°N 9.0953°W |
| Image Plan: | Ahnsen in SHG.svg |
| State: | Niedersachsen |
| District: | Schaumburg |
| Samtgemeinde: | Eilsen |
| Elevation: | 88 |
| Area: | 3.43 |
| Postal Code: | 31708 |
| Area Code: | 05722 |
| Licence: | SHG |
| Gemeindeschlüssel: | 03 2 57 001 |
| Mayor: | Heinz Grabbe |
| Party: | SPD |
Ahnsen is a municipality in the district of Schaumburg, in Lower Saxony, Germany.