William de Ferrers

William de Ferrers or Guillaume de Ferrières may refer to:
 * William de Ferrers, 3rd Earl of Derby (d. 1190)
 * William de Ferrers, 4th Earl of Derby (c. 1198–c. 1247)
 * William de Ferrers, 5th Earl of Derby (1193–1254)
 * Guillaume de Ferrières (c. 1150 – ?April 1204), the Vidame de Chartres, a French trouvère