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.