Dinosaur species starting with 'O'
The italic text is the name of the dinosaur, the name following it is the describer who found the dinosaur, the year is when the dinosaur was described.
* Ohmdenosaurus liasicus Wild, 1978
* Oligosaurus adelus Seeley, 1881
* Omeisaurus changshouensis Young, 1958
* Omeisaurus fuxiensis Dong, Zhou, et Zhang, 1983
* Omeisaurus junghsiensis Young, 1939
* Omeisaurus luoquanensis Li, 1988
* Omeisaurus tianfuensis He, Li, Cai, et Gao, 1984
* Omosaurus armatus Owen, 1875
* Omosaurus durobrivensis Hulke, 1887
* Omosaurus hastiger Owen, 1877
* Omosaurus leedsi Seeley, 1901 partim
* Omosaurus lennieri Nopcsa, 1911
* Omosaurus phillipsi Seeley, 1893
* Omosaurus vetustus Huene, 1910
* Onychosaurus hungaricus Nopcsa, 1902
* Opisthocoelicaudia skarzynskii Borsuk-Bialynicka, 1977
* Oplosaurus armatus Gervais, 1852
* Orinosaurus capensis Lydekker, 1889
* Ornatotholus browni (Wall et Galton, 1979)
* Ornitholestes hermanni Osborn, 1903
* Ornithomerus gracilis Seeley, 1881
* Ornithomimoides barasimlensis Huene et Matley, 1933
* Ornithomimoides mobilis Huene et Matley, 1933
* Ornithomimus altus Lambe, 1902
* Ornithomimus asiaticus Gilmore, 1933
* Ornithomimus edmontonensis Sternberg, 1933
* Ornithomimus elegans Parks, 1933
* Ornithomimus grandis Marsh, 1890
* Ornithomimus minutus Marsh, 1892
* Ornithomimus sedens Marsh, 1892
* Ornithomimus tenuis Marsh, 1890
* Ornithomimus velox Marsh, 1890
* Ornithopsis eucamerotus Hulke, 1882
* Ornithopsis greppini Huene, 1922
* Ornithopsis hulkei Seeley, 1870
* "Ornithopsis" leedsi Hulke, 1887
* Ornithopsis manseli Hulke (ex Lydekker, 1888)
* Ornithotarsus immanis Cope, 1869
* Orodromeus makelai Horner et Weishampel, 1988
* Orthogoniosaurus matleyi Das Gupta, 1931
* Orthomerus dolloi Seeley, 1883
* Orthomerus weberi Riabinin, 1945
* Othnielia nisti (Bakker et al., 1990)
* Othnielia rex (Marsh, 1877)
* Ouranosaurus nigeriensis Taquet, 1976
* Oviraptor mongoliensis Barsbold, 1986
* Oviraptor philoceratops Osborn, 1924
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