Fleischmannia is a genus of flowering plant in the family Asteraceae. The name honours Gottfried F. Fleischmann (1777–1850), the teacher of Carl Heinrich Schultz at University of Erlangen–Nuremberg. Members of the genus are native to South, Central, and North America, with some species found as far north as Virginia and Illinois. They are commonly known as thoroughworts. Fleischmannia is in the tribe Eupatorieae and as such has flower heads with disc florets and no ray florets. Within that tribe it is most closely related to Conoclinium and Ageratum.