| Niigata University of Rehabilitation | |
| Nikkei XTech | Tokyo |
| Nikkiso Co., Ltd | Tokyo |
| Nikko Technical Service Co., Ltd | Tokyo |
| Nikko Techno Co., Ltd | Tokyo |
| Nikko Telecommunications Co., Ltd | Tokyo |
| NikkokuSoft Co., Ltd | Tokyo |
| Nikon Corporation | Tokyo |
| Nimi University | |
| Nippan Techceed, Inc. | |
| Nippon Bunri University | |
| Nippon Card Network Co., Ltd | Tokyo |
| Nippon Chemiphar Co., Ltd | Tokyo |
| Nippon Computer Systems Co., Ltd | Tokyo |
| Nippon Dental University | |
| Nippon GPS Data Service Corporation | Tokyo |
| Nippon Ichi Software, Inc. | Nagasaki |
| Nippon Institute of Technology | |
| Nippon Intelligence, Inc. | Tokyo |
| Nippon Kayaku Co., Ltd | |
| Nippon Koshuha Co., Ltd | Kanagawa |
| Nippon Medical School Foundation | |
| Nippon Seisen Cable Ltd | |
| Nippon Shinyaku Co., Ltd | |
| Nippon Sport Science University | |
| Nippon Systemware Co., Ltd | Tokyo |
| Nippon Techno Lab, Inc. | Tokyo |
| Nippon Technology Venture Partners | |
| Nippon Telegraph and Telephone Corporation | Tokyo |
| Nippon Telegraph and Telephone East Corporation | Tokyo |
| Nippon Telegraph and Telephone West Corporation | Tokyo |
| Nippon Venture Capital Co., Ltd | Tokyo |
| Nireco Corporation | |
| Niscom Co., Ltd | Tokyo |
| Nishikyushu University | |
| Nishimura Chemitech Co., Ltd | Osaka |
| Nishinippon Institute of Technology | |
| Nishogakusha University | Tokyo |
| Nissay Capital Co., Ltd | Tokyo |
| Nissei Electric Co., Ltd | |
| Nisshin Seifun Group, Inc. | |
| Nissho Electronics Corporation | Tokyo |
| Nissin Equipment Co., Ltd | Kyoto |
| NIT Consultant Ltd | Osaka |
| Nitto Denko Corporation | Osaka |
| Nittoku Co., Ltd | |
| Nmda | Tokyo |
| NnetWorks Co., Ltd | Tokyo |
| NOA | Tokyo |
| Nobelpharma Co., Ltd | |