| Abbreviation | Definition |
|---|---|
| NF | No Fine |
| NFC | National Folklore Collection (Republic of Ireland) |
| NFML | Nuclear Fuels and Materials Library |
| NFPL | Niagara Falls Public Library |
| NFPL | Nicholas Frank Public Library |
| NFPL | North Freedom Public Library |
| NGLP | Navy General Library Program |
| NGPL | North Grenville Public Library |
| NGRL | Northwest Georgia Regional Library |
| NHCL | New Haven Community Library |
| NHCL | New Holland Community Library |
| NHDA | Netherlands Historical Data Archive |
| NIHBull | National Institutes of Health Bulletin |
| NIHBulletin | National Institutes of Health Bulletin |
| NIL | Nanoparticle Information Library |
| NILS | Northern Illinois Library System |
| NIS | Not In the Stacks |
| NISO | National Information Standards Organization |
| NJM | Netherlands Journal of Medicine |
| NJSL | New Jersey State Library |