Atrolisin A (bahasa Inggris:atrolysin A, Crotalus atrox metalloendopeptidase a; hemorrhagic toxin a; Crotalus atrox α-proteinase; Crotalus atrox proteinase; bothropasin, Crotalus atrox alpha-proteinase, Crotalus atrox metalloproteinase, Atroxase, ALA, EC 3.4.24.1code: en is deprecated ) merupakan enzim yang diisolasi dari bisaularwestern diamondback rattlesnake berjenis Crotalus atrox.