|Named By:||Scott Sampson in 1995|
|Time Period:||Upper Cretaceous, 74.5-74 Ma|
|Location:||USA, Montana - Two Medicine Formation|
|Size:||About 4.5 meters long|
|Fossil(s):||3 skulls and several hundred bones from at least 15 individuals|
|Classification:||| Chordata | Reptilia | Dinosauria | Ornithischia | Ceratopsia | Ceratopsidae | Centrosaurinae | Pachyrhinosaurini ||
Einiosaurus is a medium-sized herbivorous centrosaurine ceratopsian dinosaur from the Upper Cretaceous (Campanian stage) of northwestern Montana. The name means 'buffalo lizard', in a combination of Blackfeet Indian eini and Latinized Ancient Greek sauros; the specific name (procurvicornis) means 'with a forward-curving horn' in Latin.