Blanchefosse-et-Bay

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

{{Expand French|date=December 2008|Blanchefosse-et-Bay|topic = geo}}

{{Infobox French commune

|name = Blanchefosse-et-Bay

|commune status = Commune

|image coat of arms = Blason Blanchefosse-et-Bay.svg

|image = Bay (depuis route de Blanchefosse) 1.jpg

|caption = A general view of Bay

|arrondissement = Charleville-Mézières

|canton = Signy-l'Abbaye

|INSEE = 08069

|postal code = 08290

|mayor = Romuald Petit{{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=4 May 2022|language=fr}}

|term = 2020–2026

|intercommunality = Ardennes Thiérache

|coordinates = {{coord|49.7781|4.2367|format=dms|display=inline,title}}

|elevation m = 255

|elevation min m = 170

|elevation max m = 278

|area km2 = 20.47

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

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

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

}}

Blanchefosse-et-Bay ({{IPA|fr|blɑ̃ʃfos e bɛ}}) is a commune in the Ardennes department and Grand Est region of north-eastern France. It was created in 1974 by the merger of two former communes: Blanchefosse and Bay.[https://www.legifrance.gouv.fr/jorf/jo/id/JORFCONT000000021342 Modifications aux circonscriptions administratives territoriales (fusion de communes)], Journal officiel de la République française n° 0030, 3 February 1974, pp. 1283-1284.