| Abkürzung | Bedeutung | Kategorie |
| n | Normalität einer Lösung | Andere |
| n (in Verbindung mit Zahlen) | Brechungsindex | Andere |
| n-(in Verbindung mit Namen) | normal | Andere |
| N. N. | nomen nominandum | Andere |
| Nachw. | Nachweis | Andere |
| NAFTA | North American Free Trade Agreement | Andere |
| NAS | National Academy of Sciences (United States) | Andere |
| NASA | National Aeronautics and Space Administration (United States) | Andere |
| nat. | national | Andere |
| NBS | National Bureau of Standards (United States) | Andere |
| NCTC | National Collection of Type Cultures (United States) | Andere |
| Nd. | Niederschlag | Andere |
| NDA | New Drug Application (USA) | Andere |
| NEBIS | Netzwerk von Bibliotheken und Informationsstellen in der Schweiz | Andere |
| neg. | negativ | Andere |
| Neth. P. | Netherlands Patent | Andere |
| NGO | Non-Governmental Organization | Andere |
| NIH | National Institutes of Health (United States) | Andere |
| NIOSH | National Institute for Occupational Satety and Health (United States) | Andere |
| NL | Netherlands | Andere |
| NMR | nuclear magnetic resonance | Andere |
| NO | Norway | Andere |
| no., nos. | number, numbers | Andere |
| NOEL | no observed effect level | Andere |
| Nr., Nrn. | Nummer(n) | Andere |
| NRC | Nuclear Regulatory Commission (United States) | Andere |
| NRDC | National Research Development Corporation (United States) | Andere |
| NSC | National Service Center (United States) | Andere |
| NSF | National Science Foundation (United States) | Andere |
| NTSB | National Transportation Safety Board (United States) | Andere |
| NZ | New Zealand | Andere |
