Geoffrey de Mandeville, 2nd Earl of Essex and 4th Earl of Gloucester (c. 1191 – 23 February 1216) was an English peer. He was an opponent of King John and one of the Magna Carta sureties. Geoffrey and his brother took the surname Mandeville because of the lineage of their mother, Beatrice de Say, who was a granddaughter of Beatrice de Mandeville, the sister of Geoffrey de Mandeville, Earl of Essex (d. 1144). The elder Beatrice inherited the Mandeville honour in 1189, on the death of her nephew William de Mandeville, 3rd Earl of Essex. Richard I of England allowed her lands and the earldom to pass to her granddaughter's husband Geoffrey fitz Peter. Their eldest son Geoffrey inherited the earldom of Essex from his father in 1213.