Saint-Sernin-lès-Lavaur

{{Infobox French commune

|name = Saint-Sernin-lès-Lavaur

|commune status = Commune

|image coat of arms = Blason ville fr Saint-Sernin-lès-Lavaur (Tarn).svg

|arrondissement = Castres

|canton = Le Pastel

|INSEE = 81270

|postal code = 81700

|mayor = Patrice Biezus{{cite web|title=Répertoire national des élus: les maires|url=https://www.data.gouv.fr/fr/datasets/r/2876a346-d50c-4911-934e-19ee07b0e503|publisher=data.gouv.fr, Plateforme ouverte des données publiques françaises|date=13 September 2022|language=fr}}

|term = 2020–2026

|intercommunality =

|coordinates = {{coord|43.5489|1.9747|format=dms|display=inline,title}}

|elevation m = 210

|elevation min m = 187

|elevation max m = 275

|area km2 = 4.21

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

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

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

}}

Saint-Sernin-lès-Lavaur ({{IPA|fr|sɛ̃ sɛʁnɛ̃ lɛ lavɔʁ}}; {{langx|oc|Sant Sarnin de la Vaur}}) is a commune in the Tarn department in southern France.