Daniel Heinsius (or Heins) (9 June 1580 – 25 February 1655) was one of the most famous scholars of the Dutch Renaissance.
Heinsius was born in Ghent. The troubles of the Spanish war drove his parents to settle first at Veere in Zeeland, then to England, next at Rijwijk and lastly at Vlissingen. In 1596, being already remarkable for his attainments, he was sent to the University of Franeker to study law under Henricus Schotanus. In 1598 he settled at Leiden for the nearly sixty remaining years of his life. There he studied under Joseph Scaliger, and there he met Marnix de St Aldegonde, Janus Dousa, Paulus Merula, Hugo Grotius and others; he was soon taken into the society of these celebrated men as their equal.
His proficiency in the classical languages won the praise of all the best scholars of Europe, and offers were made to him, but in vain, to accept honourable positions outside Holland. He soon rose in dignity at the University of Leiden. In 1602 he started lecturing, in 1603 he was appointed professor of poetics, in 1605 professor of Greek, and at the death of Merula in 1607 he succeeded that illustrious scholar as the 4th librarian of Leiden University Library. In 1612 he was appointed as 'Professor Politices', the world's first chair in political science. As a classical scholar Heinsius edited many Latin and Greek classical as well as patristic authors, amongst others: Hesiod (1603), Theocritus, Bion of Smyrna and Moschus (1603), Aristotle's Ars poetica (1610), Clement of Alexandria (1616) and Terentius (1618). He brought out the Epistles of Joseph Scaliger in 1627.