AAIA: Associate International Accountant
AAIB: Air Accidents Investigation Branch
AAOH: American Ancient Order of Hibernians
AAPA: Association of Authorised Public Accountants
ABC: Activity Based Costings
ABC: Anti-social Behaviour Contract
ABD: Apprentice Boys of Derry
ABI: Association of British Investigators
ACA: Associate Chartered Accountant
ACCA: Associate Chartered Certified Accountant
ACCA: Association of Chartered Certified Accountants
ACEG: Association for Careers Education and Guidance
ACIArb: Associate of the Chartered Institute of Arbitrators
ACIB: Associate of the Chartered Institute of Bankers
ACIBS: Associate of the Chartered Institute of Bankers in Scotland
ACIBSE: Associate of the Chartered Institute of Building Services Engineers
ACIM: Associate Member of the Chartered Institute of Marketing
ACIOB: Associate of the Chartered Institute of Building
ACMA: Associate Chartered Management Accountant
ACPA: Association of Certified Public Accountants
ACPO: Association of Chief Police Officers
ACR: Area Control Room
ADA: Anti-Discrimination Association
ADC: Area Data Centre
AIA: Anglo-Irish Agreement
AIA: Association of International Accountants
AIIC: Anglo-Irish Intergovernmental Conference
AIIC: Anglo-Irish Intergovernmental Council
AIL: Anti-Internment League
AL: Appraisal Licence
ALA: Associate of the Library Association
ALJ: Association for Legal Justice
AMC: Airport Mail Centre
AMCT: Associate Member of the Association of Corporate Treasurers
AMEC: Alcohol Misuse Enforcement Campaign
AMIMA: Associate Member of the Institute of Mathematics and its Applications
AMSE: Associate Member of the Society of Engineers
AMU: Address Management Unit
ANPR: AUTOMATIC NUMBER PLATE RECOGNITION
AOH: Ancient Order of Hibernians