Countess Margaret of Rethel was a noblewoman from the medieval period, known for her marriage to Hugh IV of Rethel. She played a significant role in the political landscape of her time, as her lineage connected various noble families in France. Margaret was born around the early 12th century and was the daughter of Godefroy de Rethel. Her marriage to Hugh IV helped strengthen alliances and consolidate power within the region. She is often remembered for her contributions to the Crusades and her influence in the County of Rethel.