Adamantina is an extinct genus of jalodont chondrichthyan from the Carboniferous and Permian periods.

The type species, A. benedictae, is known from the Wuchiapingian of east Greenland and the Roadian of the Kanin Peninsula, Russia.

[3] A. foliacea is known from the late Tournaisian, late Artinskian, and the early Asselian of Russia and the late Kasimovian of Iowa, United States.

There is also a likely occurrence in the upper Pennsylvanian of Brazil.

This article about a prehistoric cartilaginous fish is a stub.