William Devereux or William d'Évreux may refer to:
William Devereux (died after 1110), Anglo-Norman nobleman William Devereux (1219–1265), Marcher Lord William Devereux (died 1376/7), knight in Herefordshire William Devereux, Baron Devereux of Lyonshall (died 1314), Marcher Lord William Devereux of Frome (died 1336), knight William Devereux of Frome (1314–1384), member of Parliament William, Count of Évreux (died 1118), Norman aristocrat William d'Evreux, son of Archbishop Robert II of Rouen, father of Judith, Countess of Sicily, and uncle of the above