Bertrand d'Ornesan, also Bertrand d'Ornezan, Baron de Saint-Blancard (d. 1540), was a French admiral in the service of King Francis I of France. He was general of the galleys of the Mediterranean (Amiral de la Flotte du Levant). Bertrand d'Ornesan tried to establish a French trading post at Pernambuco, Brazil in 1531. In 1533 Bertrand d'Ornesan joined the Ottoman embassy to France (1533) going to meet Francis I. For about twenty years, he was a business partner of the Marseilles banker Madeleine Lartessuti, who financed his fleet and was reportedly also his lover.