Ernst Platner (June 11, 1744 – December 27, 1818) was a German anthropologist, physician and philosopher born in Leipzig. He was father to painter Ernst Zacharias Platner (1773-1855).
He received his education at the University of Leipzig, where in 1770 he became an associate professor of medicine. Later at Leipzig he was appointed a full professor of physiology (1780) and philosophy (1811).
Platner was a follower of the teachings of Leibniz, and was author of Anthropologie für Aerzte und Weltweise, which was one of the more important anthropological works of the Spätaufklärung (epoch of German literature). In the field of anthropology he was a proponent of a concept that demonstrated the interplay of body and soul through physical persuasion. His work in this field was influential to scholars that included Johann Gottfried Herder, Friedrich Schiller and Karl Philipp Moritz.