Emil Osann (May 25, 1787 – January 11, 1842) was a German physician and physiologist from Weimar. He was a founder of scientific balneology. He was the brother of philologist Friedrich Gotthilf Osann (1794-1858) and chemist Gottfried Osann (1796-1866). He studied medicine in Jena and Göttingen, and later worked an assistant in a Berlin polyclinic founded by his uncle, Christoph Wilhelm Hufeland (1762–1836). In 1826 he became a full professor of Heilmittellehre (medical instruction), and in 1833 became director of the aforementioned clinic.