| 3R | Read, Research and Recall | |
| A | Anglo American Cataloguing Rule | |
| A&A | Abbreviations and Acronyms | |
| A-F | Acid-Free | |
| AA | Author’s Alteration | |
| AAAL | Alberta Association of Academic Libraries | |
| 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 | |
| AAMLO | African American Museum and Library at Oakland | |
| AAODL | Atmospheric Aerosols and Optics Data Library | |
| AARL | Australian Academic And Research Libraries | |
| AARL | Auburn Avenue Research Library | |
| AARL | African American Research Library | |
| AARL | Artpace Archive and Resource Library | |
| AASHL | Academic Health Sciences Libraries | |
| AASL | American Association of School Libraries | |
| ABAA | Antiquarian Booksellers’ Association of America | |
