Hugh I of Rethel was a nobleman from the 11th century, known for his role as the Count of Rethel, a region in present-day France. He was part of the House of Rethel, which played a significant role in the feudal system of the time. His reign contributed to the consolidation of power in the region. Hugh I was the son of Hugh of France and Adelaide of Rethel. He married Gersende of Montlhéry, further strengthening alliances through marriage. His descendants continued to influence the nobility in northern France and beyond, maintaining the legacy of the Rethel lineage.