Bonabes IV de Rougé de Derval (c. 1328 – 1377) was a French knight, Lord of Rougé and Derval, Viscount of La Guerche, Governor of South Bretagne and of Redon, General of the Breton army and later of the French King's army, and ambassador of the King of France in England. Born about 1328, he inherited the vast lands of his ancestors and began very early to fight in the war of succession to the Duchy of Brittany.