| Named By: | Zerina Johanson & Per E. Ahlberg in 1997 |
| Time Period: | Late Devonian |
| Location: | Australia - Mandagery Sandstone Formation |
| Size: | Around 1.5 to 2 meters long |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Fairly well known |
| Classification: | | Chordata | Sarcopterygii | Crossopterygii | Osteolepiforms | Tristichopteridae | |
Mandageria (Pronunciation: Man-daj-ee-ree-a fair-fax-i) is an extinct genus of lobe-finned fish. Mandageria lived in the Late Devonian period (Frasnian - Famennian). It is in related group with Hyneria, however, Mandageria was smaller, but probably it hunted in the same way.
Mandageria has been named after the philanthropist James Fairfax, and the Mandagery Sandstone formation near Canowindra, Australia in which the fossils were found. Mandageria fairfaxi is the state fossil emblem for New South Wales.