| Named By: | Powell in 1987 |
| Time Period: | Late Cretaceous 83-74 Ma |
| Location: | Argentina and Brazil |
| Size: | Estimated at 14 meters long, quite possibly larger |
| Diet: | Herbivore |
| Fossil(s): | Several individuals, but of partial remains |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropoda | Titanosauria | Aeolosauridae | Aeolosaurini | |
Aeolosaurus ("Aeolus' lizard") is a genus of titanosaurian sauropod dinosaur from the Late Cretaceous Period of what is now South America. Like most sauropods, it would have been a quadrupedal herbivore with a long neck and tail. Aeolosaurus is well known for a titanosaur, as it is represented by the remains of several individuals belonging to at least three species. However, like most titanosaurs, no remains of the skull are known. The holotype of Aeolosaurus rionegrinus consists of a series of seven tail vertebrae, as well as parts of both forelimbs and the right hindlimb. It was discovered in the Angostura Colorada Formation in Argentina, which dates from the Campanian stage of the Late Cretaceous, about 83 to 74 million years ago.