Marie-Emmanuel-Guillaume-Marguerite Théaulon de Lambert (14 August 1787, Aigues-Mortes – 16 November 1841) was a French playwright. A customs inspector, then an inspector of military hospitals, he composed an Ode on the birth of the King of Rome which brought him thanks from Napoleon himself. In 1814 he sang for the Bourbons and put on his first play, Les Clefs de Paris, ou le Dessert d’Henri IV (The Keys of Paris, or the Deservings of Henry IV), in their honour.