(b. ca. 1624, Haarlem, d. ca. 1693, Haarlem)
Dutch painter and draughtsman. In 1642 he was a pupil of Nicolaes Berchem in Haarlem. His earliest dated painting is from 1645. By 1646 he had become a master of Haarlem's Guild of St Luke, of which he was an overman in 1659-60 and 1677. In 1650-51 he was living in Rome, where he belonged to the second generation of Dutch Italianates. There are two extant drawings dating from this stay in Rome.
Romeijn's oeuvre consists almost solely of Italianate landscapes with cattle, stylistically very much influenced by works of his teacher Berchem.