Annobon dwarf gecko 
Annulated gecko 
Anolis antonii 
Anolis apletophallus 
Anolis scriptus 
Anolis umbrivagus 
Antakarana Leaf Chameleon 
Antimena chameleon 
Antongil Velvet Gecko 
Aphaniotis ornata 
Aquatic Coral Snake 
Aquatic Garter Snake 
Arabian chameleon 
Arabian cobra 
Arabian horned viper 
Argentine Black and White Tegu 
Argentine Red Tegu 
Arizona Black Rattlesnake 
Arizona Mud Turtle 
Armored Pricklenape 
Arnold's Fringe-fingered Lizard 
Arrau River turtle 
Ashy gecko 
Asian Bockadam