Constantin Freiherr von Ettingshausen (or Baron Constantin von Ettingshausen) (16 June 1826 in Vienna – 1 February 1897 in Graz) was an Austrian botanist known for his paleobotanical studies of flora from the Tertiary era.
[1] In 1848 he graduated as a doctor of medicine in Vienna, and became in 1854 a professor of botany and natural history at the medical and surgical military academy in that city.
In 1871 he was chosen professor of botany at Graz, a position which he maintained until the close of his life.
[2] From 1876 he made repeated visits to London, where he arranged collections at the Natural History Museum.
[2] The extinct genus Ettingshausenia (family Vitaceae) was named in his honor by August Wilhelm Stiehler (1857).