Marie-Madeleine Postel (28 November 1756 – 16 July 1846) - born Julie Françoise-Catherine Postel - was a French Catholic professed religious and the founder of the Sisters of Christian Schools. Postel was also a member from the Third Order of Saint Francis and had served as a schoolteacher after the French Revolution where she oversaw the education of around 300 children. The Revolution saw her use her then-disbanded school to house fugitive priests despite the great risk that posed to her own life. Postel's beatification was celebrated in 1908 and Pope Pius XI later canonized her in mid-1925.