Muttaburrasaurus (MUT-a-BURR-a-SORE-us) was a herbivorous ornithopod dinosaur related to Camptosaurus and Iguanodon, from the early Cretaceous Period of what is now northeastern Australia.

After Minmi, it is Australia's most completely known dinosaur from skeletal remains. The species was initially described from a partial skeleton found by Doug Langdon in 1963 near Muttaburra, Queensland, Australia, which place also provides the creature's name.

Muttaburrasaurus was capable of either two-legged (bipedal) or four-legged (quadrupedal) movement. The three middle digits of the forelimb were joined together into a hoof-like pad for walking on.

Muttaburrasaurus had very powerful jaws equipped with shearing teeth. These were probably an adaptation for eating tough vegetation such as cycads. It also had an enlarged, hollow, upward-bulging muzzle that might have been used to produce distinctive calls or for display purposes. However, as no fossilised nasal tissue has been found, this remains conjectural.

It was a herbivorous dinosaur that grew to 7 metres long and was active during the Albion era of the Lower Cretaceous period.