Émilie is an opera – specifically a 9-scene, 75-minute monodrama for soprano – by Finnish composer Kaija Saariaho to a libretto by Amin Maalouf. It was written in 2008. Based on the life and writings of Marquise Émilie du Châtelet (1706–1749), the work premiered at the Opéra de Lyon, France, on 1 March 2010, with Finnish soprano Karita Mattila, its dedicatee, in the title role. It recounts the achievements of this mathematician, physicist, and mistress of Voltaire: the first woman to establish an international scientific reputation, with pioneering work in the study of fire.