| Named By: | Leonardo Salgado & Rodolfo A. Coria in 2009 |
| Time Period: | Late Cretaceous |
| Location: | Argentina, Neuquen Province - Anacleto Formation |
| Size: | Unknown due to lack of fossils |
| Diet: | Herbivore |
| Fossil(s): | Three dorsal (back) vertebrae |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropoda | |
Barrosasaurus is a genus of titanosaurian sauropod dinosaur, first described by paleontologists Leonardo Salgado and Rodolfo Coria in 2009. The fossils, consisting of three fossil dorsal (back) vertebrae, are well-preserved but incomplete. They were discovered in the Anacleto Formation of the Neuquen province of western Argentina. The type species is Barrosasaurus casamiquelai. The specific epithet honours the Argentinian paleontologist Rodolfo Magin Casamiquela.