Karl Gustav Himly (30 April 1772 – 22 March 1837) was a German surgeon and ophthalmologist from Braunschweig.
From 1803 he was a professor of surgery at the University of Göttingen, where he worked with Konrad Johann Martin Langenbeck (1776–1851), and his former teacher, August Richter.
Himly was a pioneer in the field of ophthalmology, and is credited for introducing the scientific application of mydriatics into European medicine.
In addition, he performed early investigations involving the possibilities of corneal grafting.
[1] In 1802, with Johann Adam Schmidt (1759–1809), he began publication of "Ophthalmologische Bibliothek", a journal that became the first magazine dedicated to ophthalmic medicine in Germany.