| Named By: | Leonardo Salgado and Claudia Azpilicueta in 2000 |
| Time Period: | Late Cretaceous |
| Location: | Argentina, Rio Negro Province - Allen Formation |
| Size: | About 8 meters long, possibly larger |
| Diet: | Herbivore |
| Fossil(s): | Partial post cranial remains including vertebrae, pubis, ischium and left femur, possibly of a juvenile |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropodomorpha | Sauropoda | |
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 metres (26 ft) 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.