Marie-Louise de Laval-Montmorency (31 March 1723 – 24 July 1794) was a French noblewoman and nun who was the last Abbess of Montmartre.

[2] In 1759, Marie-Louise was a nun at the abbey church of Notre-Dame-du-Pré in Le Mans; her mother became a boarder at this convent in 1760 until her death in 1762.

In the final days of the Reign of Terror, she was condemned to death by the Revolutionary Tribunal for having "deafly and blindly" plotted against the republic.

Her sibling, Henriette-Louise, and her cousin, Louis-Joseph de Montmorency-Laval, had already fled France for exile abroad.

[2] Marie-Louise de Laval-Montmorency was guillotined on 24 July 1794 (5 Thermidor Year II) at the Barrière du Trône in Paris.