Rock monitor 
Rodriguez's Anole 
Rosenberg's monitor 
Rosy Boa 
Rough Greensnake 
Rough Knobtail Gecko 
Rough Mabuya 
Rough-nosed horned lizard 
Rough-scaled python 
Rough-scaled sand boa 
Roughtail Rock Agama 
Round Island Ground Skink 
Round-tailed Horned Lizard 
Rüppells snake-eyed skink 
Russells viper 
Russian tortoise 
Ruthven's Anole 
Sabah Bamboo Pitviper 
Sabah Bow-fingered Gecko 
Sabah Slender Skink 
Saddled Leaf-nosed Snake 
Sagebrush lizard 
Sahara Sand Viper 
Saint George Island Gecko