Salt Marsh Snake 
Saltwater crocodile 
San Cristóbal giant tortoise 
San Cristóbal Lava Lizard 
San Francisco garter snake 
Sand goanna 
Sand Lizard 
Sandfish Skink 
Santa Fe land iguana 
São Tomé Skink 
Sarada superba 
Satanic Leaf Tailed Gecko 
Savannah Monitor 
Savu Python 
Saw-scaled viper 
Saw-shelled turtle 
Saw-tailed Lizard 
Scalyback Anole 
Scarlet kingsnake 
Scarlet snake 
Sceloporus magister 
Schneider's Skink 
Schokar's Bronzeback 
Schreibers fringe-fingered lizard