Diogo de Azambuja (born Montemor-o-Velho, 1432; died 1518) was a Portuguese noble.He was a knight of the Order of Aviz in the service of the Infante Dom Pedro, son of the Regent Infante Peter, Duke of Coimbra. After Peter's defeat and death in the battle of Alfarrobeira (1449), he accompanied his master into exile. In 1458 he fought on the side of Afonso V in the conquest of Alcácer-Ceguer in Morocco. He received several honours and became a counselor of the king.