| Saint-Just | |
| Commune Status: | Commune |
| Arrondissement: | Bourg-en-Bresse |
| Canton: | Ceyzériat |
| Insee: | 01369 |
| Postal Code: | 01250 |
| Mayor: | Patrick Levet[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Bassin de Bourg-en-Bresse |
| Coordinates: | 46.1903°N 5.28°W |
| Elevation M: | 259 |
| Elevation Min M: | 235 |
| Elevation Max M: | 268 |
| Area Km2: | 3.38 |
Saint-Just (in French pronounced as /sɛ̃ ʒy(st)/) is a commune in the Ain department in eastern France.