Northern Cottonmouth 
Northern curly-tailed lizard 
Northern desert horned lizard 
Northern Leaf-tail Gecko 
Northern map turtle 
Northern Pacific Rattlesnake 
Northern red-bellied cooter 
Northern Ringneck Snake 
Northern Turnip-tailed Gecko 
Northern Water Snake 
Northern Western Ghats vine snake 
Northwestern garter snake 
Nose-horned viper 
O'shaughnessy's chameleon 
Obscure Emo Skink 
Ocellated Lizard 
Ocellated skink 
Ocelot gecko 
Oligodon everetti 
Olive Bush Anole 
Olive Forest Racer 
Olive Grass Racer 
Olive House Snake 
Olive Keelback