| Named By: | Rodolfo A. Coria, Juan J. Moly, Marcelo Reguero, Sergio Santillana & Sergio Marenssi in 2013 |
| Time Period: | Late Cretaceous, 80 Ma |
| Location: | Antarctica, James Ross Island - Snow Hill Formation |
| Size: | About 1.5 meters long, but possibly larger when fully grown |
| Diet: | Herbivore |
| Fossil(s): | Partial post cranial skeleton, believed to have been from a sub adult |
| Classification: | | Chordata | Reptilia | Dinosauria | Ornithischia | Ornithopoda | |
Trinisaura is an extinct genus of ornithopod dinosaur known from the lower levels of the Late Cretaceous Snow Hill Island Formation (lower Campanian stage) of James Ross Island, Antarctica. It contains a single species, Trinisaura santamartaensis.
The species was in 2013 named by Rodolfo Anibal Coria e.a. The generic name honours the geologist Trinidad Diaz. The specific name refers to the Santa Marta Cove site where the specimen was in 2008 found by Coria and Juan Jose Moly. That same year, the find was reported in the scientific literature.
The holotype, MLP-III-1-1, consists of a partial skeleton lacking the skull, of a subadult individual about 1.5 metres (4.9 ft) in length.