Heinrich Friedrich von Diez (2 September 1751 – 7 April 1817) was a German diplomat and orientalist. He was ennobled in 1789 by Frederick the Great for his diplomatic service as the Prussian chargé d'affaires to the Ottoman Empire. In his later life he served as a benefice of the Co-Cathedral Basilica of the Assumption, Kołobrzeg, which helped fund his research.