Rocasaurus (meaning "General Roca lizard") is a genus of titanosaurian sauropod that lived in South America.

Rocasaurus was discovered in Argentina in 2000, within the Allen Formation which is dated to be middle Campanian to early Maastrichtian in age (75 to 70 million years ago in the Late Cretaceous).

[2] Between 1989 and 1994, expeditions of the National University of Comahue and the Carlos Ameghino Provincial Museum collected titanosaur fossils from the locality of Salitral Moreno, 25 km south of the city of General Roca in Río Negro Province, Argentina.

[3] In 2000, Leonardo Salgado and Claudia Azpilicueta described some of these remains as representing a new genus and species, Rocasaurus muniozi.

The genus name refers to its discovery near General Roca and the species name honors Juan Carlos Muñoz, director of paleontology at the Carlos Ameghino Provincial Museum, for his support of paleontological research in the region.