| Dieffenbach-au-Val | |
| Native Name: | Diefebàch |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Dieffenbach-au-Val (Haut-Rhin).svg |
| Arrondissement: | Sélestat-Erstein |
| Canton: | Mutzig |
| Insee: | 67092 |
| Postal Code: | 67220 |
| Mayor: | Bernard Schmitt[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Vallée de Villé |
| Coordinates: | 48.315°N 7.3272°W |
| Elevation Min M: | 233 |
| Elevation Max M: | 560 |
| Area Km2: | 2.95 |
Dieffenbach-au-Val (German: Diefenbach) is a commune in the Bas-Rhin department in Alsace in north-eastern France.[2]