Piré-sur-Seiche
Piré-sur-Seiche 
    Pereg  | |
|---|---|
Part of Piré-Chancé   | |
Town square  | |
Location of Piré-sur-Seiche  | |
| Coordinates: 48°00′37″N 1°25′45″W / 48.0103°N 1.4292°W | |
| Country | France | 
| Region | Brittany | 
| Department | Ille-et-Vilaine | 
| Arrondissement | Rennes | 
| Canton | Châteaugiron | 
| Commune | Piré-Chancé | 
Area 1  | 36.34 km2 (14.03 sq mi) | 
| Population  (2022)  | 2,855 | 
| • Density | 79/km2 (200/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| Postal code | 35150  | 
| Elevation | 31–86 m (102–282 ft) | 
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Piré-sur-Seiche (French pronunciation: [piʁe syʁ sɛʃ]; Breton: Pereg) is a former commune in the Ille-et-Vilaine department of Brittany in northwestern France. On 1 January 2019, it was merged into the new commune Piré-Chancé.