The Countess of Rethel was a noble title in the historical region of Rethel, located in present-day France. This title was often held by women who were married to the Count of Rethel or who inherited the title through family lineage. The countess played a significant role in the local governance and social structure of the region during the medieval period. The title of Countess of Rethel is associated with various historical figures, including Isabelle de Rethel, who was notable for her marriage alliances that strengthened political ties. The countess's influence extended beyond her immediate territory, impacting the broader dynamics of French nobility during her time.