| News Co., Ltd | Tokyo |
| Newsbit Co., Ltd | Tokyo |
| Nexco System Solutions Co., Ltd | Tokyo |
| Nexon Co., Ltd | Tokyo |
| Next-System Co., Ltd | |
| NextGen Co., Ltd | Tokyo |
| Nextpage Co., Ltd | Hyogo |
| Nextsolution Co., Ltd | Tokyo |
| NextSolutions Co., Ltd | Tokyo |
| NF Device Technologies Co., Ltd | Tokyo |
| NGC Corporation | Tokyo |
| NHN Techorus Corporation | Tokyo |
| NIandC Soft Co., Ltd | Tokyo |
| Nice Mobile Corporation | Nagano |
| Nichei Intec Co., Ltd | |
| Nichi-Iko Pharmaceutical Co., Ltd | |
| Nichicon Corporation | |
| Nichigoh Communication Electric Wire Co., Ltd | |
| Nicolas Fournel | Niigata |
| Nidek Co., Ltd | Aichi |
| Nielsen Online Japan | Tokyo |
| Nihon Bunka University | |
| Nihon Computer Vocational School | Osaka |
| Nihon Dempa Kogyo Co., Ltd | Tokyo |
| Nihon Denkei Co., Ltd | |
| Nihon Falcom Corporation | Tokyo |
| Nihon Fukushi University | |
| Nihon Institute of Medical Science | |
| Nihon Kohden Corporation | Tokyo |
| NIhon Office Automation Research Co., Ltd | Osaka |
| Nihon Pharmaceutical Co., Ltd | |
| Nihon Pharmaceutical University | |
| Nihon Phoenix Co., Ltd | Tokyo |
| Nihon Precision Co., Ltd | Yamanashi |
| Nihon Unisys Ltd | Tokyo |
| Nihon University | |
| Niigara Institute of Science and Technology | |
| Niigata College of Nursing | |
| Niigata College of Technology | |
| Niigata Institute of Technology | |
| Niigata Internet Society | Niigata |
| Niigata Nursing and medicine College | |
| Niigata Sangyo University | |
| Niigata Seiryo University | |
| Niigata University | |
| Niigata University - Department of Mathematics | Niigata |
| Niigata University of Health and Welfare | |
| Niigata University of International and Information Studies | |
| Niigata University of Management | |
| Niigata University of Pharmacy and Medical and Life Sciences | |