Sains, Ille-et-Vilaine
Sains 
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The town hall of Sains  | |
Location of Sains  | |
| Coordinates: 48°33′07″N 1°34′59″W / 48.5519°N 1.5831°W | |
| Country | France | 
| Region | Brittany | 
| Department | Ille-et-Vilaine | 
| Arrondissement | Saint-Malo | 
| Canton | Dol-de-Bretagne | 
| Intercommunality | Pays de Dol et Baie du Mont Saint-Michel | 
| Government | |
| • Mayor (2020–2026) | Nicolas Bathellier | 
Area 1  | 10.25 km2 (3.96 sq mi) | 
| Population  (2022)  | 457 | 
| • Density | 45/km2 (120/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| INSEE/Postal code | 35248 /35610  | 
| Elevation | 19–96 m (62–315 ft) | 
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Sains (Gallo: Saent, Breton: Sent) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France.