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Saurolophus (meaning "lizard crest") is a genus of large hadrosaurine duckbill that lived about 69.5–68.5 million years ago, in the Late Cretaceous of North America and Asia; it is one of the few genera of dinosaurs known from multiple continents. It is distinguished by a spike-like crest which projects up and back from the skull. Saurolophus was an herbivorous dinosaur which could move about either bipedally or quadrupedally.

The type species, S. osborni, was described by Barnum Brown in 1912 from Canadian fossils. A second valid species, S. angustirostris, is represented by numerous specimens from Mongolia, and was described by Anatoly Konstantinovich Rozhdestvensky. A third species, S. morrisi from California, was described in 2013, and a fourth species, S. kryschtofovici from China, is considered dubious. (see more...)