ASA

ASA as an abbreviation or initialism may refer to:

==Biology and medicine== Accessible surface area of a biomolecule, accessible to a solvent Acetylsalicylic acid, aspirin Advanced surface ablation, refractive eye surgery Anterior spinal artery, the blood vessel which supplies the anterior portion of the spinal cord Antisperm antibodies, antibodies against sperm antigens Argininosuccinic aciduria, a disorder of the urea cycle ASA physical status classification system, rating of patients undergoing anesthesia