| Diou | |
| Commune Status: | Commune |
| Arrondissement: | Moulins |
| Canton: | Dompierre-sur-Besbre |
| Insee: | 03100 |
| Postal Code: | 03290 |
| Mayor: | Christian Labille[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 46.535°N 3.7453°W |
| Elevation M: | 219 |
| Elevation Min M: | 207 |
| Elevation Max M: | 276 |
| Area Km2: | 24.89 |
Diou (in French pronounced as /dju/) is a commune in the Allier department in central France.