| Abbreviation | Definition |
|---|---|
| APVO | Akron Peninsula Veterinary Office |
| AQ | Animal Quotient |
| AQIS | Australian Quarantine and Inspection Service |
| ARA | Animal Rights Activists |
| ARAV | Association of Reptilian & Amphibian Veterinarians |
| ARAZPA | Australasian Regional Association of Zoological Parks and Aquaria |
| ARBA | American Rabbit Breeders Association |
| ARC-USA | Animal Rights Coalition USA |
| ARENA | Applied Research Ethics National Association |
| ARF | Animal Research Foundation |
| ARI | Alpaca Registry, Inc. |
| ARINI | Agricultural Research Institute of Northern Ireland |
| ARKS | Animal Records Keeping System |
| ARP | Animal Research Project |
| ARPAS | American Registry of Professional Animal Scientists |
| ARS | Agricultural Research Service |
| ARV | American Rottweiler Verein |
| ARV | Avian ReoVirus |
| ARV176 | Avian ReoVirus strain 176 |
| ARVO | Alaska Rural Veterinary Outreach |