Lasserre, Ariège
| Lasserre | |
|---|---|
| Location of Lasserre | |
| Coordinates: 43°04′13″N 1°10′16″E / 43.0703°N 1.1711°E | |
| Country | France | 
| Region | Occitania | 
| Department | Ariège | 
| Arrondissement | Saint-Girons | 
| Canton | Portes du Couserans | 
| Government | |
| • Mayor (2020–2026) | Alain Bari | 
| Area 1 | 8.47 km2 (3.27 sq mi) | 
| Population  (2022) | 252 | 
| • Density | 30/km2 (77/sq mi) | 
| Time zone | UTC+01:00 (CET) | 
| • Summer (DST) | UTC+02:00 (CEST) | 
| INSEE/Postal code | 09158 /09230 | 
| Elevation | 360–576 m (1,181–1,890 ft) (avg. 574 m or 1,883 ft) | 
| 1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries. | |
Lasserre (French pronunciation: [lasɛʁ]; Occitan: La Sèrra) is a commune in the Ariège department in southwestern France.
It was the home of Alexander Grothendieck for over ten years until his death.