Otto Georg Ammon (December 7, 1842, Karlsruhe, Baden - January 14, 1916, Karlsruhe) was a Germananthropologist. Ammon was an engineer from 1863 to 1868. In 1883 he led a geographical and geological exploration of Roman roads. In 1887 he conducted anthropological research and from 1887 onwards he was a member of the Ancient Karlsruher Association and the Natural Science Association. In 1904 he received an honorary doctorate from the University of Freiburg.
He is best known for his masterwork, "Natural Selection among Humans" (1883), in which he argued that a significantly higher proportion of persons of Germanic ancestry are to be found within the European aristocracies.