| Abbreviation | Definition |
|---|---|
| ANZFA | Australia- New Zealand Food Authority (obsolete, now FSANZ) |
| AO/ASIF | Arbeitsgemeinschaft fuer Osteosynthesefragen - Association for the Study of Internal Fixation |
| AP | Animal Program |
| APA | African Pigeon Association |
| APBC | Association of Pet Behaviour Counsellors |
| APC | Animal Procedures Committee (under the Animals Scientific Procedures Act) |
| APEP | Avian Population Estimates Panel |
| APF | Animal Protein Factor |
| APHA | American Public Health Association |
| APHIN | Animal Productivity and Health Information Network (University of Prince Edward Island) |
| APHIS | Animal and Plant Health Inspection Service |
| APHSAR | Appraisal Panel for Human Suspected Adverse Reactions (of the Veterinary Medicines Directorate) |
| API | Associazione Primatologica Italiana (Italian Primate Association) |
| APLB | Association for Pet Loss and Bereavement |
| APR | American Pet Registry |
| APUA | Alliance for the Prudent Use of Antibiotics |
| APVMA | American Pre-Veterinary Medical Association |
| APVMA | Australian Pesticide And Veterinary Medicines Authority |
| APVMA | Australian Pesticides And Veterinary Management Authority |
| APVMA | Australian Pesticides And Veterinary Medicines Authority |