Louis de Dieu (7 April 1590, Flushing – 23 December 1642, Leiden) was a Dutch Protestant minister and a leading orientalist. His grandfather had served at the court of Charles V, and his father, Daniel de Dieu, was also a protestant minister and linguist. Louis was educated at Leiden, where he was regent of the Walloon College (1637-42). He declined the chair of theology and oriental languages at Utrecht.