Hugh I (1040–1118) was the count of Rethel from 1065 to 1118. He was the son of Count Manasses III and his wife Judith.
Hugh married Melisende of Crécy, the daughter of Lord Guy I of Montlhéry. They had the following children:
Manasses (1054–1115)
Gervais (1056–1124), who became count of Rethel
Baldwin (1058–1131), who became king of Jerusalem
Matilda (b. 1060), who became countess of Rethel
Hodierna, married Héribrand III of Hierges
Cecilia, who married Roger of Salerno, prince-regent of Antioch
Béatrice, who married Leo I, lord of Armenian Cilicia
