Muttaburrasaurus was a genus of herbivorous iguanodontian ornithopod dinosaur, which lived in what is now northeastern Australia sometime between 112 and 103 million years ago[1] during the early Cretaceous period.

[3][4] The species was initially described from a partial skeleton found by grazier Doug Langdon in 1963 at Rosebery Downs Station beside Thomson River near Muttaburra, in the Australian state of Queensland, which also provides the creature's generic name.

It originates from somewhat older layers of the Allaru Mudstone and was considered by Molnar to be a separate, yet unnamed species, a Muttaburrasaurus sp.

Whether Muttaburrasaurus is capable of quadrupedal movement has been debated; it was originally thought to be an "iguanodontid", though recent studies indicate a rhabdodont position.

The skull of Muttaburrasaurus was rather flat, with a triangular cross-section when seen from above; the back of the head is broad but the snout pointed.

The snout includes a strongly enlarged, hollow, upward-bulging nasal muzzle that might have been used to produce distinctive calls or for display purposes.

[2][8] A 2022 phylogenetic analysis recovered Muttaburrasaurus and Tenontosaurus as basal rhabdodontomorphs and found them to likely represent sister taxa to Rhabdodontidae.

[9] The following cladogram was recovered by Dieudonné and colleagues in 2016:[10] Anabisetia Tenontosaurus Dryomorpha Muttaburrasaurus Vegagete Ornithopod Mochlodon Rhabdodon Zalmoxes However, in 2024, Fonseca and colleagues considered Muttaburrasaurus to be outside Rhabdodontomorpha, and instead classified it as a member of the Gondwanan clade Elasmaria, alongside Fostoria dhimbangunmal.