Orange-winged Flying Lizard 
Oriental Garden Lizard 
Oriental Long-tailed Grass Lizard 
Oriental ratsnake 
Oriental Whipsnake 
Oriental wolf snake 
Ornate Cat-eyed Snake 
Ornate flying snake 
Ornate Girdled Lizard 
Ornate Olympic Snake 
Ornate Snail-eating Snake 
Ornate tree lizard 
Osborne's Lancehead 
Oudri's Fan-footed Gecko 
Ovambo tree skink 
Oxyrhopus guibei 
Pacific Bluetail Skink 
Painted Bronzeback 
Painted Coralsnake 
Painted Lip Lizard 
Painted mock viper 
Palawan bow-fingered gecko 
Palawan Gliding Dragon 
Palawan Narrow-disked Gecko