| Nia Technologies | Florida |
| Nia Therapeutics | |
| Nia Therapeutics | |
| Niagara University | New York |
| Niagara University Computer & Information Sciences | New York |
| Niagara University Mathematics | New York |
| Niantic, Inc. | California |
| Nibbio | |
| NIC Components Corporation | New York |
| NIC, Inc. | Kansas |
| NIC.PR | Puerto Rico |
| Nicasio, LLC | Georgia |
| NICE Actimize | |
| Nice Digitals | |
| Nice Global Solutions, Inc. | |
| Nice Site Design, LLC | Iowa |
| Nice Touch | |
| Nice2Link | |
| NiceChart, LLC | |
| Nicely Noted | |
| Niche Academy | Utah |
| Niche.com, Inc. | |
| NicheLabs, LLC | |
| NicheLocal, LLC | |
| Nichesoft | Texas |
| Nicholas Creative | |
| Nicholls State University Department of Mathematics | Louisiana |
| Nichols College | Massachusetts |
| Nick Benson | Minnesota |
| Nick Craver | |
| Nick Medrano | Texas |
| Nick Nikiforakis | New York |
| Nick Stone & Associates | Virginia |
| Nick Vogt | Washington |
| Nick Whitmoyer | |
| Nick, Inc. | Virginia |
| Nickel Advertising Design, Inc. | California |
| Nickel SEO | |
| NickelBronx | |
| Nico Corporation | Indiana |
| NicoDB, Inc. | California |
| Nicolet College | Wisconsin |
| NicReg, LLC | California |
| Nicslab, Inc. | California |
| Nicus Software, Inc. | Virginia |
| Nida Corporation | Florida |
| Nidish, LLC | |
| Nido Biosciences, Inc. | Massachusetts |
| Nielsen BioSciences, Inc. | California |
| Nielsen Marketing Strategry + Creativity | |