Johann Gottlieb Fleischer
Johann Gottlieb Fleischer (15 October 1797 – 22 April 1838) was a Baltic German botanist and naturalist.
Fleischer was the son of a coppersmith and was born in Mitau. He studied at the local grammar school before studying medicine at the University of Dorpat from 1817 to 1822. He received a doctorate with a thesis on Aneurysmatis varicosi complicati historia. He then worked as a physician in Mitau. He wrote on the flora and fauna of the region collaborating with Emanuel Lindemann (1795–1845) and Alexander Bunge on plants. Hie died from tuberculosis.
A member of the Moscow Imperial Society of Naturalists and the Courland Society for Literature and Art he attended a meeting of German naturalists at Hamburg in 1830.