| Bais | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason Bais 53.svg |
| Arrondissement: | Mayenne |
| Canton: | Évron |
| Mayor: | Marie-Cécile Morice[1] |
| Term: | 2020 - 2026 |
| Coordinates: | 48.2542°N -0.3642°W |
| Elevation M: | 183 |
| Elevation Min M: | 155 |
| Elevation Max M: | 337 |
| Area Km2: | 26.23 |
| Insee: | 53016 |
| Postal Code: | 53160 |
Bais is a commune in the Mayenne department in northwestern France.