| Named By: | Barbosa Rodrigues in 1892 |
| Time Period: | Early-Late Miocene (Colhuehuapian-Montehermosan)20.4-5.3 Ma |
| Location: | South America, particularly Amazonia |
| Size: | Skull up to 1.4 meters long. Body length estimated between 11 and 13 meters |
| Diet: | Carnivore |
| Fossil(s): | Several specimens, usually of skull material |
| Classification: | | Chordata | Reptilia | Crocodylomorpha | Crocodylia | Alligatoridae | Caimaninae | |
Purussaurus is an extinct genus of giant caiman that lived in South America during the Miocene epoch, from the Colhuehuapian to the Montehermosan in the SALMA classification. It is known from skull material found in the Brazilian and Peruvian Amazon, Colombian Villavieja Formation, Panamanian Culebra Formation and the Urumaco and Socorro Formations of northern Venezuela.