Marie-Aurore de Saxe (20 September 1748 – 26 December 1821), known after her first marriage as Countess of Horn and after the second as Madame Dupin de Francueil, was an illegitimate daughter of Marshal Maurice de Saxe and a grandmother of George Sand.
A notable free-thinker, she was interested in philosophers like Voltaire, Jean-Jacques Rousseau and Buffon. Her life was marked by the vicissitudes of history and personal dramas.