| Named By: | Jose Bonaparte & Fernando Novas in 1985 |
| Time Period: | Late Cretaceous, 80 Ma |
| Location: | Argentina, Patagonia, Rio Negro Province - Anacleto Formation |
| Size: | Body estimated between 7 and 9 meters long. Skull is measured at over 85 centimetres long |
| Diet: | Carnivore |
| Fossil(s): | Single incomplete skull |
| Classification: | | Chordata | Reptilia | Saurischia | Theropoda | Abelisauridae | Abelisaurinae | |
Abelisaurus ("Abel's lizard") is a genus of predatory abelisaurid theropod dinosaur during the Late Cretaceous Period (Campanian) of what is now South America. It was a bipedal carnivore that probably reached about 7.4 metres (24 ft 3 in) in length, although this is uncertain as it is known from only one partial skull.