| 2AD | To Advertise | |
| 2AD4 | To Advertise For | |
| A&P | Advertising & Promotion | |
| A. C. MOORE ARTS | Arts & Crafts Moore (more) | |
| A2C | Association des agences de communication créative | |
| AAAA | American Association for Advertising Agencies | |
| AAAA | Association of Accredited Advertising Agents | |
| AAAA | Antique Advertising Association of America | |
| AAAA | American Association of Advertising Agencies | |
| AAAJ | Advertising Agencies Association of Jamaica | |
| AAAM | Association of Advertising Agents of Macau | |
| AAAM | Advertising Agencies Association of Myanmar | |
| AAAN | Association of Advertising Agencies of Nigeria | |
| AAAN | Advertising Agencies Association of Nigeria | |
| AAFB | American Advertising Federation of Baltimore | |
| AAFB | American Advertising Federation Baltimore | |
| AAFN | American Advertising Federation Nashville | |
| AAIR | Advertising Arts in Review | |
| AAP | Alternative Advertising Possibilities | |
| AAPA | Advertising Agency Production Association | |
| AARB | Alcohol Advertising Review Board | |
| AARDS | Australian Advertising Rate and Data Service | |
| AASAM | Area Allocation System for Advertising Money | |
| ABAC | Atlanta Broadcast Advertising Club | |
| ABAC | Alcoholic Beverages Advertising Code | |
