| Named By: | W. G. Melton in 1969 |
| Time Period: | Carboniferous |
| Location: | USA, Montana |
| Size: | Roughly about 15 centimetres long |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Almost complete specimens |
| Classification: | | Chordata | Sarcopterygii | Hadronectoridae | |
Allenypterus is a genus of a prehistoric lobe-finned fish which lived during the Carboniferous period (Early Pennsylvanian to Late Mississippian, around 354-290 million years ago). Fossils have been discovered in Bear Gulch Limestone, Montana, USA.