| Abbreviation | Definition |
|---|---|
| NRPL | New Rochelle Public Library |
| NRR | North Reading Room |
| NRY | North Royalton Branch Library |
| ns | new series |
| NSDL | National Science Digital Library |
| NSDL | National SMETE Digital Library |
| NSLA | National & State Libraries Australasia |
| NSLA | Nevada State Library and Archives |
| NSPL | New Scala Plotting Library |
| NSPL | Non standard PHP library |
| NSPL | North Shore Public Library |
| NSPL | North Smithfield Public Library |
| NSTC | Nineteenth Century Short Title Catalogue |
| NSTL | National Science and Technology Library |
| NTL | NonStop Technical Library |
| NTL | Non-stop Technical Library |
| NTL | Northern Territory Library |
| NTL | The Nonstop Technical Library |
| NTML | Nebraska Transposon Mutant Library |
| NTNM | Naturwissenschaft, Technik, Neue Materialien |