| Named By: | Jorge O. Calvo and Jose F. Bonaparte in 1991 |
| Time Period: | Cenomanian99.6-97 Ma |
| Location: | Argentina, Neuquen Province - Candeleros Formation |
| Size: | Uncertain |
| Diet: | Herbivore |
| Fossil(s): | Partial post cranial remains including vertebrae and fragments of the pelvis, ribs and hind limbs |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropodomorpha | Sauropoda | Titanosauria | |
Andesaurus ( AN-da-SOR-as; "Andes lizard") is a genus of basal titanosaurian sauropod dinosaur which existed during the middle of the Cretaceous Period in South America. Like most sauropods, it would have had a small head on the end of a long neck and an equally long tail. Andesaurus was a very large animal, as were many others of its relatives, which included the largest animals ever to walk the Earth.