Robert de Saint-Clair,[a] Lord of Saint-Clair, Châteauneuf and Sorel, was a French nobleman.
Robert married Eleanor de Dreux,[1] widow of Hugues IV de Châteauneuf, she was the daughter of Robert II, Count of Dreux and Yolande de Coucy.
He remarried Isabelle de Maillebois, lady of Courville.
Robert became Lord of Châteauneuf and Sorel in 1253 after the death of Jean de Châteauneuf, Eleanor's son from her previous marriage.
Isabelle remarried in 1270, Geoffroy de Rochefort.