Xavier Léon (21 May 1868, Boulogne-Billancourt - 21 October 1935, Paris) was a French philosopher and historian of philosophy.
In 1893 Léon – together with Élie Halévy and others – helped found the French philosophical journal Revue de métaphysique et de morale. Léon remained editor of the journal until his death in 1935, when he was succeeded by Dominique Parodi. In 1900 he founded the International Congress of Philosophy, and in 1901 the Société Française de Philosophie. He wrote extensively on Johann Gottlieb Fichte. He is buried in the Jewish section of Père-Lachaise Cemetery.