| Abbreviation | Definition |
|---|---|
| ARM | Acorn RISC Machine |
| ASI | Adam Smith Institute |
| ASPH | Ashford and St Peters Hospital |
| AVCIS | Association of Chief Police Officers Vehicle Crime Intelligence Service |
| AVPB | Alternatives to Violence Project Britain |
| AWP | Arctic Warfare Police - British sniper rifle |
| BA | British Aiways |
| BAAF | British Association for Adoption and Fostering |
| BAAF | British Association for Adoption Fostering |
| BAAF | British Association of Adoption and Fostering |
| BAAG | British Agencies Afghanistan Group |
| BAAG | British Army Aid Group |
| BAAL | British Association for Applied Linguistics |
| BAAL | British Association of Applied Linguistics |
| BAAS | British Association for American Studies |
| BAAS | British Association for the Advancement of Science |
| BAAS | British Association of Audiological Scientists |
| BABA | British Artist Blacksmith Association |
| BABAO | British Association for Biological Anthropology and Osteoarchaeology |
| BABCP | British Association for Behavioural & Cognitive Psychotherapies |