Lainsecq

{{Infobox French commune

|name = Lainsecq

|commune status = Commune

|image = Lainsecq-FR-89-mairie & agence postale-07.jpg

|caption = The town hall in Lainsecq

|coordinates = {{coord|47.5556|3.2744|format=dms|display=inline,title}}

|INSEE = 89216

|postal code = 89520

|arrondissement = Auxerre

|canton = Vincelles

|mayor = Nadia Choubard{{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

|elevation min m = 219

|elevation max m = 366

|area km2 = 25.00

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

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

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

}}

Lainsecq ({{IPA|fr|lɛ̃sɛk|-|LL-Q150 (fra)-Benoît Prieur-Lainsecq.wav}}) is a commune in the Yonne department in Bourgogne-Franche-Comté in north-central France, in the natural region of Forterre.