| Saint-Jean-de-Niost | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Saint-Jean-de-Niost (Ain).svg |
| Arrondissement: | Belley |
| Canton: | Lagnieu |
| Insee: | 01361 |
| Postal Code: | 01800 |
| Mayor: | Béatrice Dalmaz[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Plaine de l'Ain |
| Coordinates: | 45.8408°N 5.2189°W |
| Elevation M: | 220 |
| Elevation Min M: | 193 |
| Elevation Max M: | 242 |
| Area Km2: | 14.19 |
Saint-Jean-de-Niost (pronounced as /fr/) is a commune in the Ain department in eastern France.
It lies on the edge of the Ain plain between Meximieux and Saint-Maurice-de-Gourdans.