Life reconstruction of D. chilensis
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Dinosauria
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Clade: Titanosauria
Genus: Domeykosaurus
Rubilar & Vargas, 2003
  • D. chilensis Rubilar & Vargas, 2003(type)

Domeykosaurus (meaning "Domeyko lizard", after 19th century scientist Ignacy Domeyko) is a genus of dinosaur from the Late Cretaceous. It was a sauropod, more specifically a Titanosaur Its fossils were found in Chile by paleontologists David Rubilar and Alexander Vargas in 2003. At 40 percent complete, the Domeykosaurus fossil is the most complete example of any dinosaur found in Chile.

Domeykosaurus was 25 feet long and 6.5 feet wide, with the long neck and tail typical of titanosaurs. It was uncharacteristically gracile, with more slender limbs than are usually associated with its type. Paleontologists speculate that the herbivore most likely ate such plants as the extant genus Araucaria, also known as the "Monkey Puzzle Tree", which is native to the area.

The type species is Domeykosaurus chilensis