| Abbreviation | Definition |
|---|---|
| NDL | Natural Derivatives Library |
| NDL | Normalized Document Length |
| NDLA | North Dakota Library Association |
| NDLB | National Digital Library of Bhutan |
| NDLTD | Networked Digital Library of Theses and Dissertations |
| ndp | non-de-plume (pen name) |
| n-d-p | non-de-plume (pen name) |
| NDSL | North Dakota State Library |
| NDSUL | North Dakota State University Library |
| NEC | Not Elsewhere Classified |
| NED | New English Dictionary |
| NEDL | New England Deposit Library |
| NEELB | North Eastern Education and Library Board |
| NEL | Nutrition Evidence Library |
| NELA | New England Library Association |
| NEnglJMed | New England Journal of Medicine |
| NESLA | New England School Library Assosiation |
| Neurotoxicol | Neurotoxicology |
| NEWTON | NEW Texts Out Now |
| NF | National Formulary |