| ningún | neither |
| Ningún escocés verdadero | No true Scotsman |
| Ninhursag | Ninhursag |
| Ninigi no Mikoto | Ninigi-no-Mikoto |
| Ninja | Ninja |
| Ninja Hattori | Hattori Hanzō |
| Ninja Sentai Kakuranger | Ninja Sentai Kakuranger |
| Ninjatō | Ninjatō |
| Ninlil | Ninlil |
| Nino | Ninus |
| Nino Buryanadze | Nino Burjanadze |
| Nino Rota | Nino Rota |
| Ninotchka | Ninotchka |
| Ninpuu Sentai Hurricaneger | Ninpuu Sentai Hurricaneger |
| Ninsuna | Ninsun |
| Nintendo | Nintendo |
| Nintendo DS | Nintendo DS |
| Nintendo DS Lite | Nintendo DS Lite |
| Nintendo Entertainment System | Nintendo Entertainment System |
| Nintendo GameCube | Nintendo GameCube |
| Nintendo iQue | Nintendo iQue |
| Nintendo Software Technology | Nintendo Software Technology |
| Nintendo WiFi Connection | Nintendo Wi-Fi Connection |
| Nintendo Zapper | NES Zapper |
| Nintu | Mami |
| Ninurta | Ninurta |
| Ninurta-apil-Ekur | Ninurta-apal-Ekur |
| Ninurta-Tukulti-Ashur | Ninurta-tukulti-Ashur |
| niobio | niobium |
| Niort | Niort |
| niple | nipple |
| Nipmuck | Nipmuck |
| Nippes | Nippes Department |
| Nippon Budokan | Nippon Budokan |
| Nippon kempo | Nippon Kempo |
| Nipponia nippon | Crested Ibis |
| Nipponosaurus | Nipponosaurus |
| Nippur | Nippur |
| Niqud | Niqqud |
| niquel | nickel |
| Nirnaeth Arnoediad | Nírnaeth Arnoediad |
| nirvana | Nirvana |
| Nirvana Sutra | Nirvana Sutra |
| NIS | Network Information Service |
| Nisaba | Nidaba |
| Nishapur | Nishapur |
| Nismo | Nismo |
| Niso | Nisos |
| Nisroch | Nisroch |
| Nissan | Nissan Motors |
| Nissan Skyline | Nissan Skyline GT-R |
| Nissan Tiida | Nissan Tiida |
| Nisán | Nisan |
| Nit | Candela per square metre |
| Nitardo | Nithard |
| Niten Ichi Ryu | Hyōhō Niten Ichi-ryū |
| Niter kibbeh | Niter kibbeh |
| Niterói | Niterói |
| nitidez | distinctness |
| Nitocris | Nitocris |
| nitrato | nitrate |
| nitrato de peroxiacetilo | peroxyacetylnitrate |
| Nitrato de plomo | Lead nitrate |
| Nitrato de potasio | Potassium nitrate |
| nitrato potásico | niter |
| nitratos | nitrate |
| nitrificación | nitrification |
| nitro | niter |
| nitrocompuestos | nitro compound |
| nitroglicerina | nitroglycerin |
| nitrosamina | nitrosamine |
| nitroso | nitrous |
| Nitrosomonas | Nitrosomonas |
| Nitrox | Enriched Air Nitrox |
| Nitruración | Nitridization |
| nitrógeno | nitrogen |
| nitrógeno orgánico | organic nitrogen |
| Nitrógeno total Kjeldahl | Total Kjeldahl Nitrogen |
| Nitya Pibulsonggram | Nit Phibunsongkhram |
| Nitón | Candela per square metre |
| Niuatoputapu | Niuatoputapu |
| Niue | Niue |
| Niutao | Niutao |
| Niué | Niue |
| nivel | extent |
| nivel acústico | sound pressure level |
| nivel anterior | previous level |
| nivel crítico | critical level |
| nivel de aire | level |
| nivel de base | background level |
| nivel de burbuja | spirit level |
| nivel de dificultad | difficulty level |
| nivel de eficiencia | efficiency level |
| nivel de enseñanza | level of education |
| nivel de entrada | access level |
| nivel de plomo en la sangre | lead level in blood |
| nivel de prioridad | priority level |
| nivel de riesgo aceptable | acceptable risk level |
| nivel de subsistencia | subsistence level |
| nivel de vida | standard of living |
| nivel del agua | water level |
| nivel del mar | sea level |
| nivel del mar en aumento | rising sea level |
| nivel del ruido | noise level |
| nivel energético | energy level |
