Marguerite d'Enghien, suo jure Countess of Brienne and of Conversano, suo jure Heiress of Enghien, and Lady of Beauvois (born 1365), was a wealthy noblewoman from the County of Hainaut in her own right, having inherited the counties of Brienne and of Conversano, and the Lordship of Enghien from her father Louis of Enghien on 17 March 1394.