| Abbreviation | Definition |
|---|---|
| NLI | National Library of Ireland |
| NLI | National Library of Israel |
| NLK | National Library of Korea |
| NLL | Navy Logistics Library |
| NLL | North Lanarkshire Libraries and Information Service |
| NLLA | Newfoundland and Labrador Library Association |
| NLM | National Library Mail |
| NLM | National Library of Medicine |
| NLM | National Library of Medicine's |
| NLNZ | National Library of New Zealand |
| NLPL | Newfoundland and Labrador Public Libraries |
| NLRK | National Library of the Republic of Kazakhstan |
| NLS | National Library of Scotland |
| NLS | National Library Service |
| NLT | National Library of Thailand |
| NLV | National Library of Vietnam |
| NLW | National Library of Wales |
| NLW | New Library World |
| NLX | Nevron library XML |
| NML | Naxos Music Library |