Friedrich Theodor von Frerichs (24 March 1819 – 14 March 1885) was a German pathologist born in Aurich. After earning his medical degree from the University of Göttingen in 1841, he returned to Aurich, where he spent several years working as an optician. In 1846 he returned to the University of Göttingen as an instructor, afterwards serving as a professor at the Universities of Kiel (1850) and Breslau (1852). In 1859 he succeeded Johann Lukas Schönlein as head physician at the Charité in Berlin. He remained at the Charité until his death in 1885. Some of his better known assistants and students included Paul Ehrlich (1854–1915), Adolf Weil (1848–1916), Paul Langerhans (1847–1888), Bernhard Naunyn (1839–1925), Heinrich Irenaeus Quincke (1842–1922), Friedrich Albin Hoffmann (1843–1924), Wilh