Dacosta, Isaac (1798-1860), a Dutch poet, born at Amsterdam, his father being a Portuguese Jew. He studied at Leyden. and in 1821 became a Christian. After the death of Bilderdijk he was the chief poet of Holland. In poetry his best known works were Political Poems, Hesperides, and The Battle of Nieuwpoort, and he also wrote a treatise on Israel and the Gentiles.