| NHS National Institute for Health and Clinical Excellence | Ni | Ni Badar |
| NI3 | Nia Long | Nia Vardalos |
| Niacin | Niagara (town), Wisconsin | Niagara, New York |
| Niagara, North Dakota | Niagara, Wisconsin | NIAID ChemDB |
| Niak | Nialamide | Niall Matter |
| Niall Quinn | Niamey | Niaprazine |
| Niar, Ardabil | Nişancı | Niğde Province |
| Niša Saveljić | Niña Amada Mía (telenovela) | Nibble |
| Nibble fish | Nibiru | Nibiru cataclysm |
| Nibley, Utah | Nic site | Nicander |
| Nicanor Duarte | Nicaragua | Nicaragua Canal |
| Nicaraguan córdoba | Niccolò de' Conti | Niccolò Machiavelli |
| Nice | Nice (Unix) | Nice Côte d'Azur Airport |
| NicePlayer | Niceritrol | Niche market |
| Nichita Stănescu | Nicholas A. Christakis | Nicholas A. Peppas |
| Nicholas and Alexandra | Nicholas Brothers | Nicholas Crafts |
| Nicholas Edward Brown | Nicholas G. Carr | Nicholas Hilliard |
| Nicholas Hoult | Nicholas II of Russia | Nicholas Lea |
| Nicholas Murray Butler | Nicholas Nahas | Nicholas of Cusa |
| Nicholas Rescher | Nicholas Ridley, Baron Ridley of Liddesdale | Nicholas Shehadie |
| Nicholas Sparks | Nicholasville, Kentucky | Nicholls, Georgia |
| Nichols (village), New York | Nichols Hills, Oklahoma | Nichols, Iowa |
| Nichols, New York | Nichols, South Carolina | Nichols, Wisconsin |
| Nicholson, Georgia | Nicias | Nick Barmby |
| Nick Bollettieri | Nick Bostrom | Nick Calathes |
| Nick Cannon | Nick Carle | Nick Carter (musician) |
| Nick Clegg | Nick Collison | Nick Gomez |
| Nick Heidfeld | Nick Johnson (basketball) | Nick Jonas |
| Nick Kyrgios | Nick Lachey | Nick Martin (educator) |
| Nick Nolte | Nick Offerman | Nick Oudendag |
| Nick Powell | Nick Stahl | Nick Swardson |
| Nick Viergever | Nick Young (basketball) | Nickel |
| Nickel(II) carbonate | Nickel(II) fluoride | Nickel(II) hydroxide |
| Nickel(II) iodide | Nickel(II) oxide | Nickel–cadmium battery |
| Nickelodeon | Nickelodeon Animation Studio | Nickelodeon Arabia |
| Nickelodeon Kids' Choice Awards | Nickelsville, Virginia | Nickerson, Kansas |
| Nickerson, Nebraska | Nicki Aycox | Nicki Minaj |
| Nicklas Bendtner | Nicklas Helenius | Nicklas Pedersen |
| Nicklback | Nickname | Nicktoons |
| Nicky Butt | Nicky Byrne | Nicky Featherstone |
| Nicky Hilton | Nicky Shorey | Nicky Weaver |
| NiCl2 | Niclas Alexandersson | Niclas Ekberg |
| Niclas Jensen | Niclas Kirkeløkke | NICMOS |
| Nico Christ | Nico Claesen | Nico Elvedi |
| Nico Hülkenberg | Nico Pulzetti | Nico Rosberg |
| Nico Van Kerckhoven | Nico van Kerckhoven | Nicocodeine |
| Nicoderm | Nicofuranose | Nicol prism |
| Nicola Amoruso | Nicola Belmonte | Nicola Berti |
| Nicola Legrottaglie | Nicola Madonna | Nicola Mingazzini |
| Nicola Pavarini | Nicola Pozzi | Nicola Rizzoli |
| Nicolaas Bloembergen | Nicolaas Laurens Burman | Nicolae Ceaușescu |
| Nicolae Dică | Nicolae Kovács | Nicolae Negrilă |
| Nicolae Rainea | Nicolae Ungureanu | Nicolaes Maas |
| Nicolaes Maes | Nicolai Boilesen | Nicolai Stepanowitsch Turczaninow |
| Nicolao Dumitru | Nicolas Anelka | Nicolas Appert |
| Nicolas Batum | Nicolas Boileau-Despréaux | Nicolas Bourbaki |
| Nicolas Bréhal | Nicolas Cage | Nicolas de Condorcet |
| Nicolas Devilder | Nicolas Dieuze | Nicolas Douchez |
| Nicolas Fatio de Duillier | Nicolas Frantz | Nicolas Frey |
| Nicolas Hoydonckx | Nicolas Kiefer | Nicolas Léonard Sadi Carnot |
| Nicolas Lombaerts | Nicolas Mahut | Nicolas Maurice-Belay |
| Nicolas N'Koulou | Nicolas Penneteau | Nicolas Petrou |
| Nicolas Plestan | Nicolas Puydebois | Nicolas Rabuel |
| Nicolas Reyes | Nicolas Sahnoun | Nicolas Sanson |
| Nicolas Sarkozy | Nicolas Steno | Nicolas-Joseph Cugnot |
| Nicolas-Théodore de Saussure | Nicolaus Copernicus | Nicolaus Cusanus |
| Nicolaus of Damascus | Nicolás Almagro | Nicolás Amodio |
| Nicolás Asencio | Nicolás Bertolo | Nicolás Burdisso |
| Nicolás Córdova | Nicolás de Piérola | Nicolás Gaitán |
| Nicolás García | Nicolás García Mayor | Nicolás Lapentti |
| Nicolás Lindley López | Nicolás Lodeiro | Nicolás Maduro |
| Nicolás Massú | Nicolás Olivera | Nicolás Otamendi |
| Nicolás Pareja | Nicolás Spolli | Nicolás Vigneri |
| Nicole Coste | Nicole Gale Anderson | Nicole Holofcener |
| Nicole Jung | Nicole Kidman | Nicole Oresme |
| Nicole Reinhardt | Nicole Richie | Nicole Saba |
| Nicole Scherzinger | Nicole Uphoff | Nicole Vaidišová |
| Nicolet, Quebec | Nicolette Pope | Nicollet, Minnesota |
| Nicollette Sheridan | Nicoma Park, Oklahoma | Nicomachus |
| Nicomorphine | Niconico | Nicorvo |
| Nicosia | Nicotiana | Nicotiana alata |
| Nicotiana glauca | Nicotianoideae | Nicotinamide adenine dinucleotide |
| Nicotinamide adenine dinucleotide phosphate | Nicotine | Nicotinic acid |
| Nicotinsäure | Nicotinyl alcohol | Nictitating membrane |
| Nidhal Guessoum | Nidhogg (video game) | Nidovirales |
| Nidwalden | Niederwald, Texas | Nielles-lès-Ardres |
| Nielles-lès-Bléquin | Nielles-lès-Calais | Niello |
| Niels Bohr | Niels Bohr Institute | Niels Giffey |
| Niels Henrik Abel | Niels Kaj Jerne | Niels Ludvig Westergaard |
| Niels Ryberg Finsen | Niels Schneider | Niels-Christian Holmstrøm |
| Nielsen's spiral | Nielsen–Olsen string | Nielsville, Minnesota |
| Niemann-Pick disease | Niemeyer | Nieuport |
| Nieuport Nighthawk | Nifedipine | Nifenazone |
| Niftawayh | Nifuroxazide | Nifurtoinol |
| Nigeh | Nigel Bishop | Nigel Clough |
| Nigel Codrington | Nigel de Jong | Nigel Hawthorne |
| Nigel Martyn | Nigel Quashie | Nigel Reo-Coker |
| Nigel Short | Nigella | Nigella damascena |
| Nigella deserti | Nigella Lawson | Nigella noeana |
| Nigella oxypetala | Nigella sativa | Nigella tenuifolia |
