Back ماجونغاصور Arabic Majungasaure Catalan Majungasaurus Czech Majungasaurus German Majungasaurus crenatissimus Spanish ماجونگاسور Persian Majungasaurus Finnish Majungasaurus French מג'ונגזאורוס HE Majungasaurus Hungarian
| Majungasaurus Temporal range: Late Cretaceous (Maastrichtian),
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| Mounted Skeleton, Stony Brook University | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Dinosauria |
| Clade: | Saurischia |
| Clade: | Theropoda |
| Superfamily: | †Abelisauroidea |
| Family: | †Abelisauridae |
| Subfamily: | †Majungasaurinae |
| Genus: | †Majungasaurus Lavocat, 1955 |
| Species: | †M. crenatissimus
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| Binomial name | |
| †Majungasaurus crenatissimus (Depéret, 1896) [originally Megalosaurus]
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| Synonyms | |
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Majungasaurus (/məˌdʒʌŋɡəˈsɔːrəs/; lit. 'Mahajanga lizard') is a genus of abelisaurid theropod dinosaur that lived in Madagascar from 70 to 66 million years ago, at the end of the Cretaceous Period, making it one of the last-known non-avian dinosaurs that went extinct during the Cretaceous–Paleogene extinction event. The genus contains a single species, Majungasaurus crenatissimus. This dinosaur is also called Majungatholus, a name which is considered a junior synonym of Majungasaurus.
Like other abelisaurids, Majungasaurus was a bipedal predator with a short snout. Although the forelimbs are not completely known, they were very short, while the hind limbs were longer and very stocky. Measuring around 7 m (23 ft) long and weighing more than 1,000 kg (2,200 lb), it can be distinguished from other abelisaurids by its wider skull, the very rough texture and thickened bone on the top of its snout, and the single rounded horn on the roof of its skull, which was originally mistaken for the dome of a pachycephalosaur. It also had more teeth in both upper and lower jaws than most abelisaurids.
The genus is one of the first abelisaurs to be discovered, first being found in 1896 (although it was thought to be a species of Megalosaurus) and being named in 1955. Known from several well-preserved skulls and abundant skeletal material, Majungasaurus has recently become one of the best-studied theropod dinosaurs from the Southern Hemisphere. It appears to be most closely related to abelisaurids from India rather than South America or continental Africa, a fact that has important biogeographical implications. Majungasaurus was the apex predator in its ecosystem, mainly preying on sauropods like Rapetosaurus, and is also one of the few dinosaurs for which there is direct evidence of cannibalism.