Simone Hannedouche (née Piettre; 13 July 1888 – 1985) was a French agrégée in letters, professor, writer, translator and anthroposophist, notable for her closeness to the movement to revive Catharism. From 1949 onwards she was one of the main collaborators with Déodat Roché on the Cahiers d'Études Cathares, a review on the history of Catharism. Her husband Louis Hannedouche was also an agrégé.