| Abbreviation | Definition |
|---|---|
| ABTA | Association of British Travel Agents |
| ABTT | Association of British Theatre Technicians |
| ABUP | Association of British University Presses |
| ACHIPPP | Association of Child Psychologists in Private Practice |
| ACHIPPP | Association of Child Psychologists in Private Practice |
| ACOBA | Advisory Committee on Business Appointments (UK) |
| ACPO | Association of Chief Police Officers |
| ADCS | Association of Director of Children’s Services |
| ADCS | Association of Director of Childrens Services |
| ADGB | Air Defence of Great Britain |
| AEP | Association of Education Psychologists |
| AGM | Award of Garden Merit |
| AIBC | Architectural Institute of British Columbia |
| ALNB | Art League New Britain |
| ALNB | Art League of New Britain |
| AMBP | Acoustics and Music of British Prehistory |
| AMHP | Approved Mental Health Professional |
| AOBM | Association Of British Muslims |
| API | Association of British Insurers |
| APPG | All-Party Parliamentary Group |