| Abbreviation | Definition |
|---|---|
| A/V | Audio/Video |
| AABP | Alliance of Area Business Publications |
| AAC | Advanced Audio Coding |
| AAOU | Avengers: Age of Ultron |
| ABC | American Broadcasting Company |
| ABC | Australian Broadcasting Commission |
| ABNA | Ahlul Bayt News Agency |
| ABP | Associated Baptist Press |
| ABSTR | Abstract |
| ACBJ | American City Business Journals, Incorporated |
| ACMAS | Attorney Client Mediation and Arbitration Service |
| ACN | Atlantis Cable News |
| ACNS | Anglican Communion News Service |
| ACP | Associated Collegiate Press |
| ACRTF | Association Canadienne de la Radio et de la Télévision de langue Française |
| ACWI | Air Combat Warfare International |
| ADIM | Art Design and Interactive Media |
| ADN | Anchorage Daily News |
| ADNP | Arizona Digital Newspaper Program |
| ADSL | Asymmetric Digital Subscriber Line |