Marie Delphine Macarty or MacCarthy (March 19, 1787 – December 7, 1849), more commonly known as Madame Blanque, until her third marriage, when she became known as Madame LaLaurie, was a New Orleans Creole socialite and serial killer who tortured and murdered slaves in her household. Born during the Spanish colonial period, Delphine Macarty married three times in Louisiana, and was twice widowed.