Léon Werth (17 February 1878, Remiremont, Vosges – 13 December 1955, Paris) was a French writer and art critic, a friend of Octave Mirbeau and a close friend and confidant of Antoine de Saint-Exupéry.
Léon Werth wrote critically and with great precision on French society through World War I, colonization, and on French "collaboration" during World War II.