Joseph Gottfried Mikan (3 September 1743 – 7 August 1814) was an Austrian-Czech botanist born in Böhmisch-Leipa (Česká Lípa). He was the father of zoologist Johann Christian Mikan (1769-1844).
He was a student in Dresden, Prague and Vienna, and served as a spa physician in Teplitz. In 1773 he became an associate professor, and two years later was appointed a full professor of botany and chemistry at the University of Prague. In 1798 he became rector of the university.
He was the author of Catalogus plantarum omnium (1776), which he dedicated to the Prague Botanical Garden. The plant genus Mikania from the family Asteraceae is named after him.