Franz Xaver
The taxon authority Franz Xaver may refer to:
- Franz Xaver Fieber (1808–1872), German entomologist
- Franz Xaver Rudolf von Höhnel (1852–1920, Höhn.), Austrian mycologist and lichenologist
- Franz Xaver von Wulfen (1728–1805), Austrian botanist and zoologist
- Johann Franz Xaver Arnold (1730–1801, J.F.Arnold), German botanist
- Johann Gottlieb Franz-Xaver Lahm (1811–1888, J.Lahm), German lichenologist
- Johannes von Nepomuk Franz Xaver Gistel (1809–1873), German naturalist (entomology, arachnology, and herpetology)