Simon de Montfort, 6th Earl of Leicester (c. 1208 – 1265), known as Simon V or VI de Montfort, was an Anglo-French nobleman who led the rebellion against King Henry III.
Simon de Montfort may also refer to: Simon I of Montfort (c. 1025–1087), Lord of Montfort l'Amaury Simon II of Montfort (c. 1068–1104), Lord of Montfort l'Amaury, son of Simon I Simon III of Montfort (1117–1181), "the Bald", Count of Évreux and Lord of Montfort l'Amaury, nephew of Simon II Simon de Montfort (died 1188) or Simon IV de Montfort, Lord of Montfort l'Amaury, son of Simon III Simon de Montfort, 5th Earl of Leicester (c. 1175–1218), also known as Simon de Montfort the Elder, a military leader in the Fourth Crusade and the Albigensian Crusade Simon de Montfort the Younger (1240–1271), second son of the 6th Earl (Simon VI or VII)
Simon de Montford, English nobleman executed in 1495, unrelated to the above
Simon de Montfort (game), a 1979 wargame