| Saint-Didier-d'Allier | |
| Arrondissement: | Le Puy-en-Velay |
| Canton: | Saint-Paulien |
| Commune: | Saint-Privat-d'Allier |
| Insee: | 43176 |
| Postal Code: | 43580 |
| Coordinates: | 44.9708°N 3.6922°W |
| Elevation M: | 850 |
| Elevation Min M: | 622 |
| Elevation Max M: | 1214 |
| Area Km2: | 7.71 |
| Population: | 48 |
| Population Date: | 2022 |
| Population Footnotes: | [1] |
Saint-Didier-d'Allier (pronounced as /fr/, literally Saint-Didier of Allier; Auvergnat: Sant Desdèir d'Alèir) is a former commune in the Haute-Loire department in south-central France. On 1 January 2017, it was merged into the commune Saint-Privat-d'Allier.[2] Its population was 48 in 2022.[1]