| Named By: | A. Martinelli & A. M. Forasiepi in 2004 |
| Time Period: | Cretaceous, Late Campanian-Early Maastrichtian |
| Location: | Argentina, Rio Negro Province - Allen Formation |
| Size: | Uncertain due to lack of remains, but is noted as being of a small size |
| Diet: | Herbivore |
| Fossil(s): | Brain case and partial post cranial remains. Fossil remains of two individuals are known |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropoda | Titanosauria | Saltasauridae | |
Bonatitan is a genus of titanosaurian dinosaur from Argentina. It lived during the Late Cretaceous. The type species is Bonatitan reigi, first described by Martinelli and Forasiepi in 2004. The specific epithet honours Osvaldo Reig. The description is based on a partial skeleton, including a braincase and caudal vertebrae.
It was named after the famous Argentine paleontologist Jose Fernando Bonaparte.