Margaret of the Blessed Sacrament was a 17th-century French Discalced Carmelite nun born in Paris. The daughter of Marie of the Incarnation, she joined the first Discalced Carmelite convent in France in 1605. Throughout her religious career, she served in various leadership roles, including acting as prioress in Tours, Bordeaux, Saintes, and Paris. She was noted for her intense religious devotion and ascetic practices during her time in the monastery on Rue Chapon, where she eventually passed away in 1660.