Abelisaurus (/əˌbɛlɪˈsɔːrəs/; "Abel's lizard") is a genus of predatory abelisaurid theropod dinosaur alive during the Late Cretaceous Period (Campanian) of what is now South America.

The specific name comahuensis honors the Comahue region of Argentina, where the fossil was found.

[2] The holotype, MC 11098, was in 1983 uncovered at the "Cantera de la Pala Mécanica"-site in the Lago Pellegrini quarries exploited by Abel since 1975.

This single known fossil of Abelisaurus consists of a skull, lacking the lower jaws, that is incomplete, especially on the right side.

However, locally Abelisaurus is known to have come from the Sr. Fernandez field, which is in the Campanian Allen Formation, which makes its stratigraphic position unclear.

[3] The Anacleto is a geologic formation in South America, dating from the early Campanian stage of the Late Cretaceous Period, between 83 and 80 million years ago.

[citation needed] As only the skull is known, it has proven difficult to provide a reliable size estimate of Abelisaurus.

[8] Others authors gave a similar size at 7.2 metres (23.6 feet) and 1.65 tonnes (1.82 short tons).

[13] As the skull of Abelisaurus was relatively broad at the back, Bonaparte and Novas drew a comparison between the newly described species and the also wide-skulled Tyrannosauridae.

[2] In 2010, Paul proposed that Abelisaurus hunted titanosaurian sauropods, such as Antarctosaurus, Pellegrinisaurus, Barrosasaurus and Neuquensaurus.