Érard de la Marck (31 May 1472, in Sedan, Ardennes - 18 March 1538) was prince-bishop of Liège from 1506 till 1538. He was the third son of Robert I de la Marck, lord of Sedan and Bouillon.
He was also lord of Jametz, bishop of Chartres (1507-1525) and archbishop of Valencia (1520-1538). He was nominated Cardinal in 1520. He first tried to obtain protection from the King of France and finally allied with the emperor. He succeeded in securing peace in the prince-bishopric during his whole reign.
His reign is considered as the most flourishing of the Bishopric of Liège. He reconstructed the prince-bishop's palace, ruined by the wars of the last century with Burgundy. He also restored many monuments, including Saint Martin collegiate church.