Dom Duarte de Menezes, (Lisbon, 1414 – near Tétouan, Morocco, 20 January 1464) was a 15th-century Portuguese nobleman and military figure. Duarte de Menezes (sometimes modernized as 'de Meneses') was the 3rd Count of Viana do Alentejo, 2nd Count of Viana (da Foz do Lima), Lord of Caminha and the first Portuguese captain of Alcácer-Ceguer.