Robert or sometimes Robert of Lewes (died 1166) was a medieval English Bishop of Bath. He began his career as a monk at Lewes Priory as well as performing administrative functions for Henry of Blois. It was Henry who secured Robert's selection as bishop. While bishop, Robert built in his diocese and set up the system of archdeacons there. He may have been the author of the Gesta Stephani, a work detailing the history of King Stephen's life.