William of Saint-Omer

William of Saint-Omer (Guillaume de Saint-Omer) can refer to several members of the House of Saint Omer:


 * William I of Saint-Omer, castellan of Saint Omer
 * William II of Saint-Omer, castellan of Saint Omer
 * William III of Saint-Omer, castellan of Saint Omer
 * William IV of Saint-Omer (died 1191), castellan of Saint Omer
 * William V of Saint-Omer (ca. 1170–1246), castellan of Saint Omer
 * William VI of Saint-Omer, castellan of Saint Omer
 * William VII of Saint-Omer, castellan of Saint Omer
 * William of Saint-Omer (son of Nicholas I), Master of the Horse of Hungary
 * William of Saint-Omer (son of Walter of Tiberias), Crusader noble