Aragosaurus (meaning "Aragon lizard") was a genus of sauropod dinosaur from the Early Cretaceous period of Galve, province of Teruel, in the autonomous territory of Aragón, Spain.

Aragosaurus was a large, quadrupedal plant-eating (herbivorous) dinosaur, which lived during the early Berriasian, about 145-140 million years ago.

It is represented by a partial skeleton, which was found in Spain and was named by Sanz, Buscalioni, Casanovi and Santafe in 1987.

Like Camarasaurus, Aragosaurus probably had a short, compact skull and a moderately long neck.

The teeth were large and wide, and would have been useful for slicing through the leaves and branches of tall conifer trees.