| Guéreins | |
| Commune Status: | Commune |
| Arrondissement: | Bourg-en-Bresse |
| Canton: | Châtillon-sur-Chalaronne |
| Insee: | 01183 |
| Postal Code: | 01090 |
| Mayor: | Claude Cleyet-Marrel[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | Val de Saône Centre |
| Coordinates: | 46.1089°N 4.7806°W |
| Elevation Min M: | 169 |
| Elevation Max M: | 232 |
| Area Km2: | 4.51 |
Guéreins (in French pronounced as /ɡeʁɛ̃/) is a commune in the Ain department in eastern France.
Guéreins is twinned with Bottens in Switzerland.