Fork-marked sand snake 
Fork-nosed Chameleon 
Four-banded Pacific iguana 
Four-clawed gecko 
Four-lined skink 
Four-toed earless skink 
Frilled Gecko 
Frilled Lizard 
Fringed Flying Dragon 
Gaboon viper 
Gaige's Rainbow lizard 
Galapagos land iguana 
Galápagos Lava Lizard 
Gem Anole 
Ghost Anole 
Giant ameiva 
Giant girdled lizard 
Giant leaf-tail gecko 
Gidgee skink 
Gila Monster 
Giri's bronzeback tree snake 
Glaw's Chameleon 
Globe-horned chameleon 
Godman's Montane Pit Viper