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Temporal range: Late Cretaceous,
~80–78 Ma
Hadrosaurus reconstruction.jpg
Reconstructed skeleton, Academy of Natural Sciences
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Ornithischia
Suborder: Ornithopoda
Family: Hadrosauridae
Subfamily: Hadrosaurinae
Genus: Hadrosaurus
Leidy, 1858
Type species
Hadrosaurus foulkii
Leidy, 1858
  • Hadrosaurus cavatus (Cope, 1871)
  • Ornithotarsus immanis (Cope, 1869)

Hadrosaurus (Hadrosaurus foulkii) was a genus of hadrosaurid dinosaur from the Upper Cretaceous period. Is the only species in its genus and is the official state dinosaur of New Jersey.

The name is dubious because no skull has been found to distinguish it from near relatives.