Matilda (1091 in Rethel – 1151) was the countess of Rethel from 1124 until 1151.
She was a daughter of Count Hugh I and Melisende of Crécy. In 1124, she succeeded her brother Gervais as countess. She ruled jointly with her husband, Odo.
Matilda and Odo had a son, Ithier (1115-1171), who succeeded Odo as count.