Jeffersonia
Jeffersonia may mean:
- In the Regnum Animalia - †Jeffersonia Poulsen, 1927 (Trilobita : Bathyuridae)
- In the Regnum Plantae -
- Jeffersonia Bart., 1793 (Magnoliophyta : Berberidaceae)
- Jeffersonia Brickell, 1800, nom. illleg. (Magnoliophyta : Gelsemiaceae) = Gelsemium