Constance de Castelbajac

{{Short description|French aristocrat and diarist}}

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| name = Constance de Castelbajac

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| birth_name = Constance Breteuil

| birth_date = 1859

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| death_date = 1886

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| occupation = Diarist

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Constance de Castelbajac (1859–1886) was a French aristocrat and diarist.{{cite web|title=Constance de Castelbajac (1859-1886)|url=http://data.bnf.fr/14477993/constance_de_castelbajac/|website=Bibliothèque nationale de France|access-date=June 7, 2016}} She served as the Marchioness of Castelbajac.

In her diary, she argued that Jewish women who converted to Christianity upon marrying remained Jewish.{{cite journal|last1=Nicault|first1=Catherine|title=Comment " en être " ? Les Juifs et la Haute Société dans la seconde moitié du xixe siècle|journal=Archives Juives|date=2009|volume=1|issue=42|pages=8–32|doi=10.3917/aj.421.0008|url=http://www.cairn.info/revue-archives-juives-2009-1-page-8.htm|access-date=June 7, 2016|via=Cairn.info|url-access=registration }} Furthermore, she disapproved of such inter-faith marriages.{{cite journal |last1=Grange |first1=Cyril |title=Les alliances de l'aristocratie avec les familles de financiers juifs à Paris, 1840-1940 : déterminants socio-démographiques et débat religieux |journal=Histoire, économie & société |language=fr |date=2014 |volume=33anné |issue=4 |pages=75–93 |doi=10.3917/hes.144.0075 |doi-access=free}} Professor Catherine Nicault of the University of Reims Champagne-Ardenne has argued that Castelbajac's views exemplified the way the French aristocracy was hostile towards Jews in the 19th century, who they viewed as parvenus.