The Madelonnettes Convent was a Paris convent in the 3rd arrondissement of Paris. It was located in what is now a rectangle between 6 rue des Fontaines du Temple, rue Volta and rue du Vertbois, and part of its site is now occupied by the Lycée Turgot. As the Madelonnettes Prison during the French Revolution, its prisoners included the writers the Marquis de Sade and Nicolas Chamfort, the politician Jean-Baptiste de Machault d'Arnouville and the actor Dazincourt.

Sébastien-Roch Nicolas, known in his adult life as Nicolas Chamfort and as Sébastien Nicolas de Chamfort, was a French writer, best known for his epigrams and aphorisms. He was secretary to Louis XVI's sister, and of the Jacobin club.