| Oedura, Velvet Geckos | |
| Onychodactylus, Clawed Salamanders | |
| Ophiomorus, Snake Skinks | |
| ~ in Europe | |
| Ophiophagus hannah, King Cobra/Hamadryad | |
| Ophisaurus, Glass Lizards | |
| Ophisops, Snake-Eyed Lizards | |
| ~ in Europe | |
| Osteolaemus tetraspis, African Dwarf Crocodile | |
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