Hugh I, Count of Montlhéry, was a nobleman in medieval France, known for his role in the region of Île-de-France. He lived during the 10th century and was part of the influential Montlhéry family, which played a significant role in local politics and land ownership. As Count, Hugh I managed various estates and was involved in the feudal system of the time. His lineage included notable descendants, such as Hugh II of Montlhéry, who continued the family's legacy. Hugh I's contributions helped shape the political landscape of the region during a formative period in French history.