Karl Anton Eugen Prantl (10 September 1849 – 24 February 1893), also known as Carl Anton Eugen Prantl, was a German botanist. Prantl was born in Munich, Kingdom of Bavaria, and studied in Munich. In 1870 he graduated with the dissertation Das Inulin. Ein Beitrag zur Pflanzenphysiologie (The inulin, a contribution to the plant physiology). He worked with Carl Wilhelm von Nägeli and Julius Sachs. From 1887 on, he published Die Natürlichen Pflanzenfamilien (The Natural Plant Families) with fellow botanist Adolf Engler, who completed the work in 1915. In 1877 he became a professor at the forest educational institution at Aschaffenburg, transferring to Breslau University in 1889, where he also became director of the botanical garden there. Prantl worked particularly on Cryptogams.