Saint-Martin-de-Castillon

{{Infobox French commune

|name = Saint-Martin-de-Castillon

|commune status = Commune

|image = St Martin de Castillon by JM Rosier.JPG

|caption = A general view of Saint-Martin-de-Castillon

|image coat of arms = Blason ville fr Saint-Martin-de-Castillon (Vaucluse).svg

|arrondissement = Apt

|canton = Apt

|INSEE = 84112

|postal code = 84750

|mayor = Charlotte Carbonnel{{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 = Pays d'Apt-Luberon

|coordinates = {{coord|43.8603|5.5125|format=dms|display=inline,title}}

|elevation m = 486

|elevation min m = 268

|elevation max m = 1072

|area km2 = 38.21

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

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

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

}}

Saint-Martin-de-Castillon ({{IPA|fr|sɛ̃ maʁtɛ̃ də kastijɔ̃}}; {{langx|oc|Sant Martin de Castilhon}}) is a commune in the Vaucluse department in the Provence-Alpes-Côte d'Azur region in southeastern France.