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| Contents: | A B C D E F G H I J K L M N O P Q R S T U V W X Y Z – See also |
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- Ohmdenosaurus
- Ojoceratops
- Ojoraptorsaurus
- Oligosaurus – junior synonym of Rhabdodon
- Olorotitan
- Omeisaurus
- Omnivoropteryx - probably a bird
- "Omosaurus" – preoccupied name, now known as Dacentrurus
- Onychosaurus – synonym of Rhabdodon, or a dubious ankylosaurian
- Opisthocoelicaudia
- Oplosaurus
- "Orcomimus" – nomen nudum
- Orinosaurus – junior synonym (unneeded replacement name) of Orosaurus
- Orkoraptor
- Ornatotholus
- Ornithodesmus
- "Ornithoides" – nomen nudum; Saurornithoides
- Ornitholestes
- Ornithomerus – junior synonym of Rhabdodon
- Ornithomimoides
- Ornithomimus
- Ornithopsis
- Ornithosuchus – actually a non-dinosaurian archosaur
- Ornithotarsus – possible junior synonym of Hadrosaurus
- Orodromeus
- Orosaurus – possible junior synonym of Euskelosaurus
- Orthogoniosaurus
- Orthomerus
- Oryctodromeus
- "Oshanosaurus" – nomen nudum
- Osmakasaurus
- Ostafrikasaurus
- Othnielia
- Othnielosaurus
- "Otogosaurus" – nomen nudum
- Ouranosaurus
- Oviraptor
- "Ovoraptor" – nomen nudum; Velociraptor
- Owenodon
- Oxalaia
- Ozraptor
Read more about this topic: List Of Dinosaurs