The Congregation of Our Lady of Sion (French: Congrégation de Notre-Dame de Sion, abbreviated by its members as N.D.S.) is composed of two Roman Catholic religious congregations founded in Paris, France. One is composed of Catholic priests and Religious Brothers, founded in 1852, and the other is composed of Religious Sisters, founded in 1843, both by Marie Theodor Ratisbonne, along with his brother Marie-Alphonse Ratisbonne, "to witness in the Church and in the world that God continues to be faithful in his love for the Jewish people and to hasten the fulfillment of the promises concerning the Jews and the Gentiles." (Constitution, article 2).