Forest Whiptail 
Fork-marked sand snake 
Fork-nosed Chameleon 
Four-banded Pacific iguana 
Four-clawed gecko 
Four-lined skink 
Four-toed earless skink 
Freshwater Crocodile 
Frilled Gecko 
Frilled Lizard 
Fringed Flying Dragon 
Gaboon viper 
Gaige's Rainbow lizard 
Galapagos land iguana 
Galápagos Lava Lizard 
Galápagos tortoise 
Gem Anole 
Geoffroy’s side-necked turtle 
Gharial 
Ghost Anole 
Giant ameiva 
Giant girdled lizard 
Giant leaf-tail gecko 
Gidgee skink