|Named By:||Othniel Charles Marsh in 1878|
|Time Period:||Upper Jurassic, Upper Cretaceous|
|Location:||USA, Wyoming - Morrision Formation. Canada, Alberta|
|Fossil(s):||Very partial and fragmentary remains|
|Classification:||| Chordata | Reptilia | Dinosauria | Ornithischia | Ornithopoda | Hypsilophodontidae ||
Laosaurus (meaning "stone or fossil lizard") is a genus of neornithischian dinosaur. The type species is Laosaurus celer, first described by O.C. Marsh in 1878 from remains from the Oxfordian-Tithonian-age Upper Jurassic Morrison Formation of Wyoming. The validity of this genus is doubtful because it is based on fragmentary fossils. A second species from the Morrison Formation, L. gracilis, and a species from the late Cretaceous of Alberta, Laosaurus minimus, are also considered dubious.