Carl Ludwig von Hablitz (1752–1821), also known as Karl Ivanovich Gablits, was a German born Russian botanist.
He was born in Königsberg, in 1758 his father was invited to work on the University of Moscow. Carl arrived at Russia at the age of 6 years. He studied to be a scientific botanist and later taught at the University of Moscow for many years. He was a member of the Imperial Russian Academy of sciences.
He was the author of Physical description of Taurid area, its position and three empires of nature (1785).
Hablitz was the maternal grandfather of the Russian composer Alexander Serov and great-grandfather of the Russian painter Valentin Serov.