Marie-Alphonse Ratisbonne, NDS (1 May 1814, Strasbourg, Alsace, France – 6 May 1884, Ein Karem, Mutasarrifate of Jerusalem, Ottoman Empire) was a French Jew who converted to Christianity and became a Jesuit priest and missionary. He later was a co-founder of the Congregation of Our Lady of Sion, a religious congregation dedicated to the conversion of Jews to the Christian faith.[1]