Willem van Haecht, sometimes also Willem van Haecht the elder to distinguish him from the painter Willem van Haecht (ca 1530 – after 1585) was a Flemish poet writing in the Dutch language. He was also a cloth merchant, draughtsman, a bookseller and publisher. He was a member since 1552 and from 1558 a factor of the chamber of rhetoric De Violieren in Antwerp. In that role he played an important part in the transition of the development of theatre in Flanders from plays mainly dealing with epic, moralising or allegorising themes towards plays expressing the humanist ideas of the Renaissance. He published the Psalms of the Bible in Dutch verse and also wrote poems and songs.