| Image Coa: | Grosses Wappen Diepenau.png |
| Coordinates: | 52.4228°N 8.7333°W |
| Image Plan: | Diepenau in NI.svg |
| State: | Niedersachsen |
| District: | Nienburg/Weser |
| Samtgemeinde: | Uchte |
| Elevation: | 44 |
| Area: | 70.05 |
| Postal Code: | 31603 |
| Area Code: | 05775 und 05777 |
| Licence: | NI |
| Gemeindeschlüssel: | 03 2 56 004 |
| Divisions: | 5 |
| Website: | www.diepenau.de |
| Mayor: | Annegret Trampe |
| Bürgermeistertitel: | Bürgermeisterin |
| Party: | CDU |
Diepenau is a municipality in the district of Nienburg, in Lower Saxony, Germany.