Rocasaurus (meaning "Roca City Lizard") is a genus of titanosaurian sauropod that lived in South America about 80 million years ago, during the Late Cretaceous. This genus grew up to 8 meters long, making it one of the smaller sauropods. Rocasaurus was discovered in Argentina in 2000. The type species, Rocasaurus muniozi, was formally described by Salgado and Azpilicueta in 2000.