Léonie Martin, also known as Sister Françoise-Thérèse, VHM, (3 June 1863 – 16 June 1941) was a French Roman Catholic nun who led a cloistered life as a member of the Visitation Sisters.
She was the daughter of Saints Louis Martin and Marie-Azélie Guérin Martin and an elder sister of Saint Thérèse of Lisieux.
She is sometimes dubbed Saint Thérèse's "difficult sister".
She assumed the religious name of Françoise-Thérèse.
Her cause for beatification was permitted to be introduced in the diocese of Bayeux and Lisieux in 2015, and she has been given the posthumous title Servant of God.