| Abbreviation | Definition |
|---|---|
| A | Anglo American Cataloguing Rule |
| A&A | Abbreviations and Acronyms |
| AA | Author's Alteration |
| AAB | Aberdeen Abbreviated Browser |
| AABF | Ann Arbor Book Festival |
| AACL | Alberta Association of College Librarians |
| AACN | Clinical Issues |
| AACN | Clinical Issues in Critical Care Nursing |
| AACR | Anglo American Cataloguing Rules |
| AADL | Ann Arbor District Library |
| AAEL | Ann Arbor Electrogram Libraries |
| AALL | American Association of Law Libraries |
| AALT | Alberta Association of Library Technicians |
| AARL | African American Research Library |
| AARL | Artpace Archive and Resource Library |
| AARL | Auburn Avenue Research Library |
| AARL | Australian Academic And Research Libraries |
| AASHL | Academic Health Sciences Libraries |
| AASL | American Association of School Libraries |
| ABAA | Antiquarian Booksellers' Association of America |