The Duc de Barrois (died 1790s) was a french noble who lived during the French Revolution in the Marais district.

An influential noble, de Barrois used his power to send many of his enemies and rivals to the guillotine and then take their properties and goods for himself. His corrupt deeds were noted by the Parisian Assassins after the renovation of the Café du Marais, who then sent Arno Dorian to eliminate de Barrois, who was hosting a theatrical performance in the Hôtel de Sully.

With de Barrois dead, the corruption in the area declined, and the number of Extremists decreased while the number of Vigilantes increased.