| Image Coa: | Wappen Warmsen.png |
| Coordinates: | 52.4547°N 8.8508°W |
| Image Plan: | Warmsen in NI.svg |
| State: | Niedersachsen |
| District: | Nienburg/Weser |
| Samtgemeinde: | Uchte |
| Elevation: | 46 |
| Area: | 81.61 |
| Postal Code: | 31606 |
| Area Code: | 05767 |
| Licence: | NI |
| Gemeindeschlüssel: | 03 2 56 034 |
| Divisions: | 6 |
| Website: | www.warmsen.de |
| Mayor: | Karsten Heineking |
| Party: | CDU |
Warmsen is a municipality in the district of Nienburg, in Lower Saxony, Germany.