Lasserre, Ariège

{{Use dmy dates|date=August 2023}}

{{short description|Commune in Occitanie, France}}

{{Expand French|topic=geo|date=December 2008|Lasserre (Ariège)}}

{{Infobox French commune

|name = Lasserre

|commune status = Commune

|arrondissement = Saint-Girons

|canton = Portes du Couserans

|INSEE = 09158

|postal code = 09230

|mayor = Alain Bari{{cite web|title=Répertoire national des élus: les maires|url=https://www.data.gouv.fr/fr/datasets/r/2876a346-d50c-4911-934e-19ee07b0e503|website=data.gouv.fr, Plateforme ouverte des données publiques françaises|date=2 December 2020|language=fr}}

|term = 2020–2026

|intercommunality =

|coordinates = {{coord|43.0703|1.1711|format=dms|display=inline,title}}

|elevation m = 574

|elevation min m = 360

|elevation max m = 576

|area km2 = 8.47

|population = {{France metadata Wikidata|population_total}}

|population date = {{France metadata Wikidata|population_as_of}}

|population footnotes = {{France metadata Wikidata|population_footnotes}}

}}

Lasserre ({{IPA|fr|lasɛʁ}}; {{langx|oc|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.