The Countess of Rethel was a noble title in the medieval region of Rethel, located in present-day France. The 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 local governance and social affairs, often managing estates and participating in courtly life. The title of Countess of Rethel is historically linked to the broader context of the County of Rethel, which was part of the Holy Roman Empire. The county was established in the 9th century and was known for its strategic location and economic importance during the Middle Ages.