Botanist and university teacher (1791-1849).
József Sadler (6 May 1791 – 12 March 1849) was a Hungarian medical doctor and botanist. He studied the plants of the Budapest region, and served as a curator of natural history at the Hungarian National Museum. As a professor of botany at the medical school in the University of Pest, he influenced numerous Hungarian naturalists, including József Dorner. Sadler was born in Pozsony in a family of modest means. After completing high school studies, Sadler became a pharmacist's assistant at the pharmacy of the Order of Mercy. He completed a pharmacy course at the University of Pest and received a