| Named By: | Rodrigo Santucci and Reinaldo Bertini in 2006 |
| Time Period: | Late Cretaceous |
| Location: | Brazil - Adamantina Formation |
| Size: | Unknown due to lack of remains |
| Diet: | Herbivore |
| Fossil(s): | Six caudal (tail) vertebrae |
| Classification: | | Chordata | Reptilia | Dinosauria | Saurischia | Sauropoda | Titanosauria | |
Adamantisaurus ( AD-a-man-ti-SAWR-as) is a poorly-known genus of titanosaurian sauropod dinosaur from the Late Cretaceous Period of what is now South America. It is only known from six tail vertebrae but, as a sauropod, it can be assumed that this dinosaur was a very large animal with a long neck and tail.
Like many titanosaurians, Adamantisaurus is incompletely known, making its exact relationships difficult to establish. However, similarities have been noted with Aeolosaurus and the Bauru Group titanosaurian formerly known as the "Peiropolis titanosaur", now called Trigonosaurus.