Theillay

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

{{Infobox French commune

|name = Theillay

|commune status = Commune

|image = Eglisetheillay.jpg

|caption = Church of Saint-Sulpice

|image coat of arms = Blason ville fr theillay (loir-et-cher).svg

|arrondissement = Romorantin-Lanthenay

|canton = Selles-sur-Cher

|INSEE = 41256

|postal code = 41300

|mayor = Gérard Chopin{{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 = Sologne des rivières

|coordinates = {{coord|47.3144|2.0411|format=dms|display=inline,title}}

|elevation min m = 96

|elevation max m = 168

|area km2 = 96.38

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

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

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

}}

Theillay ({{IPA|fr|tɛjɛ}}) is a commune of the Loir-et-Cher department in central France.