| Abbreviation | Definition |
|---|---|
| AA | Aiven Andrians |
| AA | Alan Alexander |
| AA | Apache Anne |
| AAFA | Antique Americana Folk Art |
| AAW | Adolph A. Weinman, sculptor and coin designer |
| AB | Allan Border |
| AB | Americo Bartholomew |
| AB | Angela Brant |
| AB | Annie Besant |
| ABD | American Born Desi |
| ABE | Abraham Lincoln |
| AC | Alan Cox |
| AC | Albert Champion |
| AC | Alvin Crawford |
| AC | Anne Cameron |
| ACC | Arthur C. Clarke |
| ACM | Antonio Carlos Magalhaes |
| ACM | Arthur C. Mills |
| ACR | Alvah C. Roebuck (of Sears, Roebuck, and Company) |
| AD | Andrew Darnall |