Karl Eduard von Eichwald known as Karl Eichwald (Russian: Эдуард Иванович Эйхвальд, Eduard Ivanovich Eykhvald; 4 July 1795, in Mitau, Courland Governorate – 10 November 1876, in Saint Petersburg) was a Baltic German geologist, physician, and naturalist, who lived his whole life in the Russian Empire.

Eichwald was a Baltic German born at Mitau in Courland Governorate.

[1] He travelled much in the Russian Empire, and was a keen observer of its natural history and geology.

[2] His published works include Reise auf dem Caspischen Meere und in den Caucasus, 2 volumes (Stuttgart and Tübingen, 1834-1838); Die Urwelt Russlands (St Petersburg, 1840-1845); Le Lethaea Rossica, ou Paléontologie de la Russie, 3 volumes (Stuttgart, 1852-1868), with Atlases.

[1] In the scientific field of herpetology he described several new species of reptiles.