| ninetieth | nonagésimo |
| ninety | noventa |
| Nineveh | Nínive |
| Ningal | Ningal |
| Ningbing False Antechinus | Pseudantechinus ningbing |
| Ningbo | Ningbo |
| Ningxia | Ningxia |
| Ninhursag | Ninhursag |
| Ninigi-no-Mikoto | Ninigi no Mikoto |
| Ninja | Ninja |
| Ninja Sentai Kakuranger | Ninja Sentai Kakuranger |
| Ninjatō | Ninjatō |
| Ninlil | Ninlil |
| Ninnies | Los idiotas |
| Nino Burjanadze | Nino Buryanadze |
| Nino Rota | Nino Rota |
| Ninotchka | Ninotchka |
| Ninoy Aquino International Airport | Aeropuerto Internacional de Manila |
| Ninpuu Sentai Hurricaneger | Ninpuu Sentai Hurricaneger |
| Ninsun | Ninsuna |
| Nintendo | Nintendo |
| Nintendo DS | Nintendo DS |
| Nintendo DS Lite | Nintendo DS Lite |
| Nintendo Entertainment System | Nintendo Entertainment System |
| Nintendo Entertainment System hardware clone | Famiclón |
| Nintendo GameCube | Nintendo GameCube |
| Nintendo iQue | Nintendo iQue |
| Nintendo Software Technology | Nintendo Software Technology |
| Nintendo Wi-Fi Connection | Nintendo WiFi Connection |
| ninth | noveno |
| Ninth Council of Toledo | IX Concilio de Toledo |
| Ninth Crusade | Octava Cruzada |
| Ninth dynasty of Egypt | Dinastía IX de Egipto |
| Ninurta | Ninurta |
| Ninurta-apal-Ekur | Ninurta-apil-Ekur |
| Ninurta-tukulti-Ashur | Ninurta-Tukulti-Ashur |
| Ninus | Nino |
| Nio | Niō |
| Niobe | Níobe |
| niobium | niobio |
| Niokolo-Koba National Park | Parque Nacional Niokolo-Koba |
| Niort | Niort |
| nip | pellizcar |
| nip in the bud | cortar de raíz |
| nip off | cortar |
| Nipkow disk | Disco de Nipkow |
| Nipmuck | Nipmuck |
| Nippes Department | Nippes |
| nipple | pezón |
| Nipple clamp | Paréntesis |
| Nippon | Japón |
| Nippon Budokan | Nippon Budokan |
| Nippon Kempo | Nippon kempo |
| Nippon Professional Baseball | Liga Japonesa de Béisbol Profesional |
| Nippon Telegraph and Telephone | NTT |
| Nipponosaurus | Nipponosaurus |
| Nippur | Nippur |
| nippy | rápido |
| Niqqud | Niqud |
| Niqāb | Nicáb |
| Nirvana | nirvana |
| Nirvana discography | Discografía de Nirvana |
| Nirvana Sutra | Nirvana Sutra |
| Nisa | Nicea |
| Nisan | Nisán |
| Nisargadatta Maharaj | Sri Nisargadatta Maharaj |
| Nishapur | Nishapur |
| Nisibis | Acre |
| Nismo | Nismo |
| Nisos | Niso |
| Nisroch | Nisroch |
| Nissan Group | Nissan |
| Nissan Motors | Nissan |
| Nissan River | Nissan |
| Nissan Skyline GT-R | Nissan Skyline |
| Nissan Stadium | Estadio Internacional de Yokohama |
| Nissan Tiida | Nissan Tiida |
| Nissl body | Cuerpos de Nissl |
| Nistru | Dniéster |
| nit | liendre |
| Nit Phibunsongkhram | Nitya Pibulsonggram |
| niter | nitro |
| Niter kibbeh | Niter kibbeh |
| Niteroi | Manaos |
| Niterói | Niterói |
| Niterói Contemporary Art Museum | Museo de Arte Contemporáneo de Niterói |
| Nithard | Nitardo |
| Nitmiluk National Park | Parque Nacional Nitmiluk |
| Nitobe Inazō | Inazo Nitobe |
| Nitocris | Nitocris |
| nitpicking | pedantería |
| Nitra District | Distrito de Nitra |
| Nitra Region | Región de Nitra |
| nitrate | nitrato |
| nitric acid | ácido nítrico |
| Nitric oxide synthase | Óxido nítrico sintetasa |
| Nitridization | Nitruración |
| nitrification | nitrificación |
| nitro compound | nitrocompuestos |
| Nitro-gliycerin | Nitroglicerina |
| Nitroaldol reaction | Reacción de Henry |
| nitrogen | nitrógeno |
| nitrogen cycle | ciclo del nitrógeno |
| nitrogen dioxide | dióxido de nitrógeno |
| nitrogen fixation | fijación de nitrogeno |
| Nitrogen group | Grupo del nitrógeno |
| nitrogen monoxide | monóxido de nitrógeno |
| nitrogen oxide | óxido de nitrógeno |
| nitrogen oxides | oxidos de nitrógeno |
| Nitrogen-based fertilisers | Abonos nitrogenados |
| Nitrogen-containing base | Base nitrogenada |
| Nitrogenous base | Base nitrogenada |
| nitrogenous fertiliser | fertilizante nitrogenado |
| Nitrogenous fertilisers | Abonos nitrogenados |
| nitroglycerin | nitroglicerina |
| nitroglycerine | nitroglicerina |
| nitrosamine | nitrosamina |
| Nitrosomonas | Nitrosomonas |
| nitrous | nitroso |
| nitrous oxide | óxido nitroso |
| nitty-gritty | fondo |
| nitwit | estúpido |
| Niuatoputapu | Niuatoputapu |
| Niue | Niue |
| Niue national football team | Selección de fútbol de Niue |
| Niujie Mosque | Mezquita de Niujie |
| Niutao | Niutao |
| Nivelles | Nivelles |
| Nivelles-Baulers | Nivelles |
| Nix | Nix |
| Nixie tube | Tubo Nixie |
| Nizam | Nizam |
| Nizam al-Mulk | Nizam al-Mulk |
| Nizar Qabbani | Nizar Qabbani |
| Nizaris | Nizaríes |
| Nizhni Novgorod | Nizhny Nóvgorod |
| Nizhny Novgorod | Nizhny Nóvgorod |
| Nizhny Novgorod Oblast | Óblast de Nizhny Nóvgorod |
| Niçoise salad | Ensalada nicosia |
| Nièvre | Nièvre |
| Niña | La Niña |
| Niğde | Provincia de Niğde |
| Niğde Province | Provincia de Niğde |
| Niš | Niš |
| Njord | Njörðr |
| Njörðr | Njörðr |
| NK Dinamo Zagreb | NK Dinamo Zagreb |
| NK Domžale | NK Domžale |
| NK Inter Zaprešić | NK Inter Zaprešić |
| NK Maribor | NK Maribor |
| NK Osijek | NK Osijek |
| NK Rijeka | Rijeka |
| NK Varteks | NK Varteks Varaždin |
| NK Zagreb | NK Zagreb |
| Nkhata Bay District | Distrito de Nkhata Bay |
| Nkhotakota District | Distrito de Nkhotakota |
| Nkulunkulu Mnikati wetibusiso temaSwati | Nkulunkulu Mnikati wetibusiso temaSwati |
| NKVD | NKVD |
| NL | NL |
| NME | NME |
| NMEA | NMEA |
| NMR spectroscopy | Espectroscopia de resonancia magnética nuclear |
| no | ningún |
| no control | sin control |
| no doubt | sin la menor duda |
