| Abbreviation | Definition |
|---|---|
| NOPL | North Onondaga Public Library |
| NOPL | Northern Onondaga Public Libraries |
| NOPL | Northern Onondaga Public Library |
| NORLA | Network of Radical Libraries and Archives |
| NPG | Nature Publishing Group |
| NPL | Naperville Public Library |
| NPL | Nashville Public Library |
| NPL | Nashville Public Library's |
| NPL | Newark Public Library |
| NPL | Norfolk Public Library |
| NPL | Normal Public Library |
| NPL | Norristown Public Library |
| NPLS | Nunavut Public Library Services |
| NPPL | North Perth Public Library |
| NPTL | Native Posix Thread Library |
| NPTL | Native Posix Threading Library |
| NPTL | Native POSIX Threads Library |
| NPTL | New Posix Thread Library |
| NPTL | North Portland Tool Library |
| NR | Not Requested |