Anne-Thérèse de Marguenat de Courcelles (1647 – 12 July 1733), who on her marriage became Madame de Lambert, Marquise de Saint-Bris, and is generally known as the Madame de Lambert, was a French writer and salonnière.
During the Régence, when the court of the Duchesse du Maine, at the Château de Sceaux, was amusing itself with frivolities, and when that of the Duc d’Orléans, at the Palais-Royal, was devoting itself to debauchery, the salon of the Marquise de Lambert passed for the temple of propriety and good taste, in a reaction against the cynicism and vulgarity of the time. For the cultivated people of the time, it was a true honor to be admitted to the celebrated "Tuesdays", where the dignity and high class of the "Great Century" were still in the air.