Thomas Hyde (29 June 1636 – 18 February 1703) was an English linguist, historian, librarian, classicist, and orientalist. His chief work was the 1700 De Vetere Religione Persarum [On the Ancient Religion of the Persians], the first attempt to use Arab and Persian sources to correct the errors of Greek and Roman historians in their descriptions of Zoroastrianism and the other beliefs of the ancient Persians.