| Named By: | Jose P. O'Gorman, Leonardo Salgado, Eduardo B. Olivero & Sergio A. Marenssi in 2015 |
| Time Period: | Late Cretaceous, 72 Ma |
| Location: | Antarctica, Vega Island - Snow Hill Island Formation |
| Size: | Holotype individual roughly about 6.7 meters long |
| Diet: | Carnivore/Piscivore |
| Fossil(s): | Almost complete skeleton |
| Classification: | | Chordata | Reptilia | Sauropterygia | Plesiosauria | Elasmosauridae | |
Vegasaurus is an extinct genus of elasmosaurid plesiosaur known from the Late Cretaceous (early Maastrichtian stage) Snow Hill Island Formation of Vega Island, Antarctic Peninsula. It contains a single species, Vegasaurus molyi.