Acadian hairstreak 
Acadian hermit crab 
Acalypha wilkesiana 
Acalypta parvula 
Acanthagrion lancea 
Acanthocephala terminalis 
Acanthocoris scabrator 
Acanthoplus discoidalis 
Acanthosaura capra 
Acanthosaura crucigera 
Acanthostachys strobilacea 
Acarospora fuscata 
Acavus haemastoma 
Acer circinatum 
Acer platanoides 
Acer tataricum 
Acetabularia major 
Achemon sphinx 
Acherontia atropos 
Acherontia lachesis 
Achiote 
Achlys triphylla 
Achrioptera fallax 
Ackee apple