Ranzania may refer to:
Ranzania (fish), a genus of fish in the family Molidae with several fossil species and one extant species Ranzania laevis, the slender sunfish, the only extant species in the fish genus Ranzania (plant), a genus of plants in the family Berberidaceae
The genus Ranzania Bertoloni, 1855 (in the beetle family Scarabaeidae) is now called Rhamphorrhina Klug, 1855.