| Abbreviation | Definition |
|---|---|
| NML | Norris Medical Library |
| NMLA | New Mexico Library Association |
| NMLS | National Map Library of Scotland |
| NMLS | Nicholson Memorial Library System |
| NMML | Nehru Memorial Museum & Library |
| NMPL | New Milford Public Library |
| NMPL | North Manchester Public Library |
| NMSL | New Mexico State Library |
| NMU-L | University of New Mexico Law Library |
| NMU-M | University of New Mexico Library of the Medical Sciences |
| NMUP | Muttontown Preserve, Muttontown, New York Library code |
| NNL | Nepal National Library |
| NNLM | National Network of Libraries of Medicine |
| NNYLN | Northern New York Library Network |
| NOBLE | North Of Boston Library Exchange |
| NODLINET | National Open and Distance Learner's Library and Information Network |
| NOL | Not On Loan (library) |
| NOLA | Northeast Ohio Library Association |
| NOLS | North Olympic Library System |
| NOPL | New Orleans Public Library |